When I attack a mob, they will attack me, however if I take a single step back they will not follow me and continue attacking me, they will just sit still.

NPCCombat:
Code:
package com.ew.game.npc.combat;

import com.ew.game.Animation;
import com.ew.game.Entity;
import com.ew.game.ForceMovement;
import com.ew.game.World;
import com.ew.game.WorldTile;
import com.ew.game.npc.NPC;
import com.ew.game.npc.familiar.Familiar;
import com.ew.game.npc.godwars.zaros.Nex;
import com.ew.game.npc.pest.PestPortal;
import com.ew.game.player.content.Combat;
import com.ew.utils.MapAreas;
import com.ew.utils.Utils;

public final class NPCCombat {

	private NPC npc;
	private int combatDelay;
	private Entity target;

	public NPCCombat(NPC npc) {
		this.npc = npc;
	}

	public int getCombatDelay() {
		return combatDelay;
	}

	/*
	 * returns if under combat
	 */
	public boolean process() {
		if (combatDelay > 0)
			combatDelay--;
		if (target != null) {
			if (!checkAll()) {
				removeTarget();
				return false;
			}
			if (combatDelay <= 0)
				combatDelay = combatAttack();
			return true;
		}
		return false;
	}

	/*
	 * return combatDelay
	 */
	private int combatAttack() {
		Entity target = this.target; // prevents multithread issues
		if (target == null)
			return 0;
		// if hes frooze not gonna attack
		if (npc.getFreezeDelay() >= Utils.currentTimeMillis())
			return 0;
		// check if close to target, if not let it just walk and dont attack
		// this gameticket
		NPCCombatDefinitions defs = npc.getCombatDefinitions();
		int attackStyle = defs.getAttackStyle();
		int maxDistance = attackStyle == NPCCombatDefinitions.MELEE
				|| attackStyle == NPCCombatDefinitions.SPECIAL2 ? 0 : 7;
		if ((!(npc instanceof Nex))
				&& !npc.clipedProjectile(target, maxDistance == 0))
			return 0;
		int distanceX = target.getX() - npc.getX();
		int distanceY = target.getY() - npc.getY();
		int size = npc.getSize();
		if (distanceX > size + maxDistance || distanceX < -1 - maxDistance
				|| distanceY > size + maxDistance
				|| distanceY < -1 - maxDistance) {
			return 0;
		}
		addAttackedByDelay(target);
		return CombatScriptsHandler.specialAttack(npc, target);
	}

	protected void doDefenceEmote(Entity target) {
		/*
		 * if (target.getNextAnimation() != null) // if has att emote already
		 * return;
		 */
		target.setNextAnimationNoPriority(new Animation(Combat
				.getDefenceEmote(target)));
	}

	public Entity getTarget() {
		return target;
	}

	public void addAttackedByDelay(Entity target) { // prevents multithread
													// issues
		target.setAttackedBy(npc);
		target.setAttackedByDelay(Utils.currentTimeMillis()
				+ npc.getCombatDefinitions().getAttackDelay() * 600 + 600); // 8seconds
	}

	public void setTarget(Entity target) {
		this.target = target;
		npc.setNextFaceEntity(target);
		if (!checkAll()) {
			removeTarget();
			return;
		}
	}

	public boolean checkAll() {
		Entity target = this.target; // prevents multithread issues
		if (target == null)
			return false;
		if (npc.isDead() || npc.hasFinished() || npc.isForceWalking()
				|| target.isDead() || target.hasFinished() || npc.getPlane() != target.getPlane())
			return false;
		if (npc.getFreezeDelay() >= Utils.currentTimeMillis())
			return true; // if freeze cant move ofc
		int distanceX = npc.getX() - npc.getRespawnTile().getX();
		int distanceY = npc.getY() - npc.getRespawnTile().getY();
		int size = npc.getSize();
		int maxDistance;
		if (!npc.isNoDistanceCheck() && !npc.isCantFollowUnderCombat()) {
			maxDistance = 32;
			if (!(npc instanceof Familiar)) {

				if (npc.getMapAreaNameHash() != -1) {
					// if out his area
					if (!MapAreas.isAtArea(npc.getMapAreaNameHash(), npc)
							|| (!npc.canBeAttackFromOutOfArea() && !MapAreas
									.isAtArea(npc.getMapAreaNameHash(), target))) {
						npc.forceWalkRespawnTile();
						return false;
					}
				} else if (distanceX > size + maxDistance
						|| distanceX < -1 - maxDistance
						|| distanceY > size + maxDistance
						|| distanceY < -1 - maxDistance) {
					// if more than 64 distance from respawn place
					npc.forceWalkRespawnTile();
					return false;
				}
			}
			maxDistance = 16;
			distanceX = target.getX() - npc.getX();
			distanceY = target.getY() - npc.getY();
			if (distanceX > size + maxDistance
					|| distanceX < -1 - maxDistance
					|| distanceY > size + maxDistance
					|| distanceY < -1 - maxDistance)
				return false; // if target distance higher 16
		} else {
			distanceX = target.getX() - npc.getX();
			distanceY = target.getY() - npc.getY();
		}
		// checks for no multi area :)
		if (npc instanceof Familiar) {
			Familiar familiar = (Familiar) npc;
			if (!familiar.canAttack(target))
				return false;
		} else {
			if (!npc.isForceMultiAttacked()) {
				if (!target.isAtMultiArea() || !npc.isAtMultiArea()) {
					if (npc.getAttackedBy() != target
							&& npc.getAttackedByDelay() > Utils
									.currentTimeMillis())
						return false;
					if (target.getAttackedBy() != npc
							&& target.getAttackedByDelay() > Utils
									.currentTimeMillis())
						return false;
				}
			}
		}
		if(!npc.isCantFollowUnderCombat()) {
			// if is under
			int targetSize = target.getSize();
			if (distanceX < size && distanceX > -targetSize && distanceY < size
					&& distanceY > -targetSize && !target.hasWalkSteps()) {
				
				/*System.out.println(size + maxDistance);
				System.out.println(-1 - maxDistance);*/
				npc.resetWalkSteps();
				if (!npc.addWalkSteps(target.getX() + 1, npc.getY())) {
					npc.resetWalkSteps();
					if (!npc.addWalkSteps(target.getX() - size, npc.getY())) {
						npc.resetWalkSteps();
						if (!npc.addWalkSteps(npc.getX(), target.getY() + 1)) {
							npc.resetWalkSteps();
							if (!npc.addWalkSteps(npc.getX(), target.getY() - size)) {
								return true;
							}
						}
					}
				}
				return true;
			}if (npc.getCombatDefinitions().getAttackStyle() == NPCCombatDefinitions.MELEE &&
					targetSize == 1
					&& size == 1
					&& Math.abs(npc.getX() - target.getX()) == 1
					&& Math.abs(npc.getY() - target.getY()) == 1
					&& !target.hasWalkSteps()) {
				
				if (!npc.addWalkSteps(target.getX(), npc.getY(), 1))
					npc.addWalkSteps(npc.getX(), target.getY(), 1);
				return true;
			}

			 int attackStyle = npc.getCombatDefinitions().getAttackStyle();
			    if (npc instanceof Nex) {
				Nex nex = (Nex) npc;
				maxDistance = nex.isForceFollowClose() ? 0 : 7;
				if (!nex.isFlying() && (!npc.clipedProjectile(target, maxDistance == 0 && !forceCheckClipAsRange(target))) || !Utils.isOnRange(npc.getX(), npc.getY(), size, target.getX(), target.getY(), targetSize, maxDistance)) {
				    npc.resetWalkSteps();
				    if (!Utils.isOnRange(npc.getX(), npc.getY(), size, target.getX(), target.getY(), targetSize, 10)) {
					int[][] dirs = Utils.getCoordOffsetsNear(size);
					for (int dir = 0; dir < dirs[0].length; dir++) {
					    final WorldTile tile = new WorldTile(new WorldTile(target.getX() + dirs[0][dir], target.getY() + dirs[1][dir], target.getPlane()));
					    if (World.isTileFree(tile.getPlane(), tile.getX(), tile.getY(), size)) { // if
														     // found
														     // done
						npc.setNextForceMovement(new ForceMovement(new WorldTile(npc), 0, tile, 1, Utils.getMoveDirection(tile.getX() - npc.getX(), tile.getY() - npc.getY())));
						npc.setNextAnimation(new Animation(17408));
						npc.setNextWorldTile(tile);
						nex.setFlying(false);
						return true;
					    }
					}
				} else
				    // if doesnt need to move more stop moving
				    npc.resetWalkSteps();
			    } else {
				// MAGE_FOLLOW and RANGE_FOLLOW follow close but can attack far
				// unlike melee
				maxDistance = npc.isForceFollowClose() ? 0 : 1; //(attackStyle == NPCCombatDefinitions.MELEE || attackStyle == NPCCombatDefinitions.MAGE_FOLLOW || attackStyle == NPCCombatDefinitions.RANGE_FOLLOW) ? 0 : 7;
				npc.resetWalkSteps();
				// is far from target, moves to it till can attack
				if ((!npc.clipedProjectile(target, maxDistance == 0 && !forceCheckClipAsRange(target))) || !Utils.isOnRange(npc.getX(), npc.getY(), size, target.getX(), target.getY(), targetSize, maxDistance)) {
				   // if (!npc.calcFollow(target, npc.getRun() ? 2 : 1, true, npc.isIntelligentRouteFinder()) && combatDelay < 3 && attackStyle == NPCCombatDefinitions.MELEE)
					//combatDelay = 3;
				    //return true;
				}
				// if under target, moves

			    }
			}
		}
		return true;
	}
	
    private boolean forceCheckClipAsRange(Entity target) {
    	return target instanceof PestPortal;
    }	

	public void addCombatDelay(int delay) {
		combatDelay += delay;
	}

	public void setCombatDelay(int delay) {
		combatDelay = delay;
	}

	public boolean underCombat() {
		return target != null;
	}

	public void removeTarget() {
		this.target = null;
		npc.setNextFaceEntity(null);
	}

	public void reset() {
		combatDelay = 0;
		target = null;
	}

}
NPC.java
Code:
package com.ew.game.npc;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import com.ew.Settings;
import com.ew.cache.loaders.ItemDefinitions;
import com.ew.cache.loaders.NPCDefinitions;
import com.ew.cores.CoresManager;
import com.ew.game.Animation;
import com.ew.game.Entity;
import com.ew.game.Graphics;
import com.ew.game.Hit;
import com.ew.game.Hit.HitLook;
import com.ew.game.World;
import com.ew.game.WorldTile;
import com.ew.game.item.Item;
import com.ew.game.npc.combat.NPCCombat;
import com.ew.game.npc.combat.NPCCombatDefinitions;
import com.ew.game.npc.familiar.Familiar;
import com.ew.game.player.Player;
import com.ew.game.player.content.FriendChatsManager;
import com.ew.game.player.content.slayer.SlayerManager;
import com.ew.game.player.controlers.Wilderness;
import com.ew.game.tasks.WorldTask;
import com.ew.game.tasks.WorldTasksManager;
import com.ew.utils.Logger;
import com.ew.utils.MapAreas;
import com.ew.utils.NPCBonuses;
import com.ew.utils.NPCCombatDefinitionsL;
import com.ew.utils.NPCDrops;
import com.ew.utils.Utils;

public class NPC extends Entity implements Serializable {

	private static final long serialVersionUID = -4794678936277614443L;

	private int id;
	private WorldTile respawnTile;
	private int mapAreaNameHash;
	private boolean canBeAttackFromOutOfArea;
	private boolean randomwalk;
	private int[] bonuses; // 0 stab, 1 slash, 2 crush,3 mage, 4 range, 5 stab
	// def, blahblah till 9
	private boolean spawned;
	private transient NPCCombat combat;
	public WorldTile forceWalk;

	private long lastAttackedByTarget;
	private boolean cantInteract;
	private int capDamage;
	private int lureDelay;
	private boolean cantFollowUnderCombat;
	private boolean forceAgressive;
	private int forceTargetDistance;
	private boolean forceFollowClose;
	private boolean forceMultiAttacked;
	private boolean noDistanceCheck;

	// npc masks
	private transient Transformation nextTransformation;
	//name changing masks
	private String name;
	private transient boolean changedName;
	private int combatLevel;
	private transient boolean changedCombatLevel;
	private transient boolean locked;
	
	private boolean intelligentRouteFinder;
	
    public boolean isIntelligentRouteFinder() {
    	return intelligentRouteFinder;
    }

    public void setIntelligentRouteFinder(boolean irf) {
    	this.intelligentRouteFinder = irf;
    }
	
	private transient double dropRateFactor;
	
    public double getDropRateFactor() {
    	return dropRateFactor;
    }

    public void setDropRateFactor(double drf) {
    	this.dropRateFactor = drf;
    }
	
	public NPC(int id, WorldTile tile, int mapAreaNameHash,
			boolean canBeAttackFromOutOfArea) {
		this(id, tile, mapAreaNameHash, canBeAttackFromOutOfArea, false);
	}

	/*
	 * creates and adds npc
	 */
	public NPC(int id, WorldTile tile, int mapAreaNameHash,
			boolean canBeAttackFromOutOfArea, boolean spawned) {
		super(tile);
		this.id = id;
		this.respawnTile = new WorldTile(tile);
		this.mapAreaNameHash = mapAreaNameHash;
		this.canBeAttackFromOutOfArea = canBeAttackFromOutOfArea;
		this.setSpawned(spawned);
		combatLevel = -1;
		setHitpoints(getMaxHitpoints());
		setDirection(getRespawnDirection());
		setRandomWalk((getDefinitions().walkMask & 0x2) != 0
				|| forceRandomWalk(id));
		bonuses = NPCBonuses.getBonuses(id);
		combat = new NPCCombat(this);
		capDamage = -1;
		lureDelay = 12000;
		// npc is inited on creating instance
		initEntity();
		World.addNPC(this);
		World.updateEntityRegion(this);
		// npc is started on creating instance
		loadMapRegions();
		checkMultiArea();
	}

	@Override
	public boolean needMasksUpdate() {
		return super.needMasksUpdate() || nextTransformation != null || changedCombatLevel || changedName;
	}

	public void transformIntoNPC(int id) {
		setNPC(id);
		nextTransformation = new Transformation(id);
	}
	
	/**
	 * From mx2, needed this method 
	 * @param id
	 */
	public void setNextNPCTransformation(int id) {
		setNPC(id);
		nextTransformation = new Transformation(id);
		if (getCustomCombatLevel() != -1)
		    changedCombatLevel = true;
		if (getCustomName() != null)
		    changedName = true;
	}

	public void setNPC(int id) {
		this.id = id;
		bonuses = NPCBonuses.getBonuses(id);
	}

	@Override
	public void resetMasks() {
		super.resetMasks();
		nextTransformation = null;
		changedCombatLevel = false;
		changedName = false;
	}

	public int getMapAreaNameHash() {
		return mapAreaNameHash;
	}

	public void setCanBeAttackFromOutOfArea(boolean b) {
		canBeAttackFromOutOfArea = b;
	}
	
	public boolean canBeAttackFromOutOfArea() {
		return canBeAttackFromOutOfArea;
	}

	public NPCDefinitions getDefinitions() {
		return NPCDefinitions.getNPCDefinitions(id);
	}

	public NPCCombatDefinitions getCombatDefinitions() {
		return NPCCombatDefinitionsL.getNPCCombatDefinitions(id);
	}

	@Override
	public int getMaxHitpoints() {
		return getCombatDefinitions().getHitpoints();
	}

	public int getId() {
		return id;
	}

	public void processNPC() {
		if (isDead() || locked)
			return;
		if (getId() == 945) {
			setName("Eriewin Tutor");
		}
		if (!combat.process()) { // if not under combat
			if (!isForceWalking()) {// combat still processed for attack delay
				// go down
				// random walk
				if (!cantInteract) {
					if (!checkAgressivity()) {
						if (getFreezeDelay() < Utils.currentTimeMillis()) {
							if (((hasRandomWalk()) && World.getRotation(
									getPlane(), getX(), getY()) == 0) // temporary
									// fix
									&& Math.random() * 1000.0 < 100.0) {
								int moveX = (int) Math
										.round(Math.random() * 10.0 - 5.0);
								int moveY = (int) Math
										.round(Math.random() * 10.0 - 5.0);
								resetWalkSteps();
								if (getMapAreaNameHash() != -1) {
									if (!MapAreas.isAtArea(getMapAreaNameHash(), this)) {
										forceWalkRespawnTile();
										return;
									}
									addWalkSteps(getX() + moveX, getY() + moveY, 5);
								}else 
									addWalkSteps(respawnTile.getX() + moveX, respawnTile.getY() + moveY, 5);
							}
						}
					}
				}
			}
		}
		if (isForceWalking()) {
			if (getFreezeDelay() < Utils.currentTimeMillis()) {
				if (getX() != forceWalk.getX() || getY() != forceWalk.getY()) {
					if (!hasWalkSteps())
						addWalkSteps(forceWalk.getX(), forceWalk.getY(),
								getSize(), true);
					if (!hasWalkSteps()) { // failing finding route
						setNextWorldTile(new WorldTile(forceWalk)); // force
						// tele
						// to
						// the
						// forcewalk
						// place
						forceWalk = null; // so ofc reached forcewalk place
					}
				} else
					// walked till forcewalk place
					forceWalk = null;
			}
		}
	}

	@Override
	public void processEntity() {
		super.processEntity();
		processNPC();
	}

	public int getRespawnDirection() {
		NPCDefinitions definitions = getDefinitions();
		if (definitions.anInt853 << 32 != 0 && definitions.respawnDirection > 0
				&& definitions.respawnDirection <= 8)
			return (4 + definitions.respawnDirection) << 11;
		return 0;
	}

	/*
	 * forces npc to random walk even if cache says no, used because of fake
	 * cache information
	 */
	private static boolean forceRandomWalk(int npcId) {
		switch (npcId) {
		case 11226:
			return true;
		case 3341:
		case 3342:
		case 3343:
			return true;
			/**
			 * Lumbridge Slayer Cave NPCs.
			 */
		case 1828:
		case 1829:
		case 1632:
		case 1832:
		case 1831:
		case 1600:
			
			 
		default:
			return false;
			/*
			 * default: return NPCDefinitions.getNPCDefinitions(npcId).name
			 * .equals("Icy Bones");
			 */
		}
	}
	
	public void sendSoulSplit(final Hit hit, final Entity user) {
		final NPC target = this;
		if (hit.getDamage() > 0)
			World.sendProjectile(user, this, 2263, 11, 11, 20, 5, 0, 0);
		user.heal(hit.getDamage() / 5);
		WorldTasksManager.schedule(new WorldTask() {
			@Override
			public void run() {
				setNextGraphics(new Graphics(2264));
				if (hit.getDamage() > 0)
					World.sendProjectile(target, user, 2263, 11, 11, 20, 5, 0,
							0);
			}
		}, 1);
	}

	@Override
	public void handleIngoingHit(final Hit hit) {
		if (capDamage != -1 && hit.getDamage() > capDamage)
			hit.setDamage(capDamage);
		if (hit.getLook() != HitLook.MELEE_DAMAGE
				&& hit.getLook() != HitLook.RANGE_DAMAGE
				&& hit.getLook() != HitLook.MAGIC_DAMAGE)
			return;
		Entity source = hit.getSource();
		if (source == null)
			return;
		if (source instanceof Player) {
			final Player p2 = (Player) source;
			if (p2.getPrayer().hasPrayersOn()) {
				if (p2.getPrayer().usingPrayer(1, 18)) 
					sendSoulSplit(hit, p2);
				if (hit.getDamage() == 0)
					return;
				if (!p2.getPrayer().isBoostedLeech()) {
					if (hit.getLook() == HitLook.MELEE_DAMAGE) {
						if (p2.getPrayer().usingPrayer(1, 19)) {
							p2.getPrayer().setBoostedLeech(true);
							return;
						} else if (p2.getPrayer().usingPrayer(1, 1)) { // sap
							// att
							if (Utils.getRandom(4) == 0) {
								if (p2.getPrayer().reachedMax(0)) {
									p2.getPackets()
									.sendGameMessage(
											"Your opponent has been weakened so much that your sap curse has no effect.",
											true);
								} else {
									p2.getPrayer().increaseLeechBonus(0);
									p2.getPackets()
									.sendGameMessage(
											"Your curse drains Attack from the enemy, boosting your Attack.",
											true);
								}
								p2.setNextAnimation(new Animation(12569));
								p2.setNextGraphics(new Graphics(2214));
								p2.getPrayer().setBoostedLeech(true);
								World.sendProjectile(p2, this, 2215, 35, 35,
										20, 5, 0, 0);
								WorldTasksManager.schedule(new WorldTask() {
									@Override
									public void run() {
										setNextGraphics(new Graphics(2216));
									}
								}, 1);
								return;
							}
						} else {
							if (p2.getPrayer().usingPrayer(1, 10)) {
								if (Utils.getRandom(7) == 0) {
									if (p2.getPrayer().reachedMax(3)) {
										p2.getPackets()
										.sendGameMessage(
												"Your opponent has been weakened so much that your leech curse has no effect.",
												true);
									} else {
										p2.getPrayer().increaseLeechBonus(3);
										p2.getPackets()
										.sendGameMessage(
												"Your curse drains Attack from the enemy, boosting your Attack.",
												true);
									}
									p2.setNextAnimation(new Animation(12575));
									p2.getPrayer().setBoostedLeech(true);
									World.sendProjectile(p2, this, 2231, 35,
											35, 20, 5, 0, 0);
									WorldTasksManager.schedule(new WorldTask() {
										@Override
										public void run() {
											setNextGraphics(new Graphics(2232));
										}
									}, 1);
									return;
								}
							}
							if (p2.getPrayer().usingPrayer(1, 14)) {
								if (Utils.getRandom(7) == 0) {
									if (p2.getPrayer().reachedMax(7)) {
										p2.getPackets()
										.sendGameMessage(
												"Your opponent has been weakened so much that your leech curse has no effect.",
												true);
									} else {
										p2.getPrayer().increaseLeechBonus(7);
										p2.getPackets()
										.sendGameMessage(
												"Your curse drains Strength from the enemy, boosting your Strength.",
												true);
									}
									p2.setNextAnimation(new Animation(12575));
									p2.getPrayer().setBoostedLeech(true);
									World.sendProjectile(p2, this, 2248, 35,
											35, 20, 5, 0, 0);
									WorldTasksManager.schedule(new WorldTask() {
										@Override
										public void run() {
											setNextGraphics(new Graphics(2250));
										}
									}, 1);
									return;
								}
							}

						}
					}
					if (hit.getLook() == HitLook.RANGE_DAMAGE) {
						if (p2.getPrayer().usingPrayer(1, 2)) { // sap range
							if (Utils.getRandom(4) == 0) {
								if (p2.getPrayer().reachedMax(1)) {
									p2.getPackets()
									.sendGameMessage(
											"Your opponent has been weakened so much that your sap curse has no effect.",
											true);
								} else {
									p2.getPrayer().increaseLeechBonus(1);
									p2.getPackets()
									.sendGameMessage(
											"Your curse drains Range from the enemy, boosting your Range.",
											true);
								}
								p2.setNextAnimation(new Animation(12569));
								p2.setNextGraphics(new Graphics(2217));
								p2.getPrayer().setBoostedLeech(true);
								World.sendProjectile(p2, this, 2218, 35, 35,
										20, 5, 0, 0);
								WorldTasksManager.schedule(new WorldTask() {
									@Override
									public void run() {
										setNextGraphics(new Graphics(2219));
									}
								}, 1);
								return;
							}
						} else if (p2.getPrayer().usingPrayer(1, 11)) {
							if (Utils.getRandom(7) == 0) {
								if (p2.getPrayer().reachedMax(4)) {
									p2.getPackets()
									.sendGameMessage(
											"Your opponent has been weakened so much that your leech curse has no effect.",
											true);
								} else {
									p2.getPrayer().increaseLeechBonus(4);
									p2.getPackets()
									.sendGameMessage(
											"Your curse drains Range from the enemy, boosting your Range.",
											true);
								}
								p2.setNextAnimation(new Animation(12575));
								p2.getPrayer().setBoostedLeech(true);
								World.sendProjectile(p2, this, 2236, 35, 35,
										20, 5, 0, 0);
								WorldTasksManager.schedule(new WorldTask() {
									@Override
									public void run() {
										setNextGraphics(new Graphics(2238));
									}
								});
								return;
							}
						}
					}
					if (hit.getLook() == HitLook.MAGIC_DAMAGE) {
						if (p2.getPrayer().usingPrayer(1, 3)) { // sap mage
							if (Utils.getRandom(4) == 0) {
								if (p2.getPrayer().reachedMax(2)) {
									p2.getPackets()
									.sendGameMessage(
											"Your opponent has been weakened so much that your sap curse has no effect.",
											true);
								} else {
									p2.getPrayer().increaseLeechBonus(2);
									p2.getPackets()
									.sendGameMessage(
											"Your curse drains Magic from the enemy, boosting your Magic.",
											true);
								}
								p2.setNextAnimation(new Animation(12569));
								p2.setNextGraphics(new Graphics(2220));
								p2.getPrayer().setBoostedLeech(true);
								World.sendProjectile(p2, this, 2221, 35, 35,
										20, 5, 0, 0);
								WorldTasksManager.schedule(new WorldTask() {
									@Override
									public void run() {
										setNextGraphics(new Graphics(2222));
									}
								}, 1);
								return;
							}
						} else if (p2.getPrayer().usingPrayer(1, 12)) {
							if (Utils.getRandom(7) == 0) {
								if (p2.getPrayer().reachedMax(5)) {
									p2.getPackets()
									.sendGameMessage(
											"Your opponent has been weakened so much that your leech curse has no effect.",
											true);
								} else {
									p2.getPrayer().increaseLeechBonus(5);
									p2.getPackets()
									.sendGameMessage(
											"Your curse drains Magic from the enemy, boosting your Magic.",
											true);
								}
								p2.setNextAnimation(new Animation(12575));
								p2.getPrayer().setBoostedLeech(true);
								World.sendProjectile(p2, this, 2240, 35, 35,
										20, 5, 0, 0);
								WorldTasksManager.schedule(new WorldTask() {
									@Override
									public void run() {
										setNextGraphics(new Graphics(2242));
									}
								}, 1);
								return;
							}
						}
					}

					// overall

					if (p2.getPrayer().usingPrayer(1, 13)) { // leech defence
						if (Utils.getRandom(10) == 0) {
							if (p2.getPrayer().reachedMax(6)) {
								p2.getPackets()
								.sendGameMessage(
										"Your opponent has been weakened so much that your leech curse has no effect.",
										true);
							} else {
								p2.getPrayer().increaseLeechBonus(6);
								p2.getPackets()
								.sendGameMessage(
										"Your curse drains Defence from the enemy, boosting your Defence.",
										true);
							}
							p2.setNextAnimation(new Animation(12575));
							p2.getPrayer().setBoostedLeech(true);
							World.sendProjectile(p2, this, 2244, 35, 35, 20, 5,
									0, 0);
							WorldTasksManager.schedule(new WorldTask() {
								@Override
								public void run() {
									setNextGraphics(new Graphics(2246));
								}
							}, 1);
							return;
						}
					}
				}
			}
		}

	}

	@Override
	public void reset() {
		super.reset();
		setDirection(getRespawnDirection());
		combat.reset();
		bonuses = NPCBonuses.getBonuses(id); // back to real bonuses
		forceWalk = null;
	}

	@Override
	public void finish() {
		if (hasFinished())
			return;
		setFinished(true);
		World.updateEntityRegion(this);
		World.removeNPC(this);
	}

	public void setRespawnTask() {
		if (!hasFinished()) {
			reset();
			setLocation(respawnTile);
			finish();
		}
		CoresManager.slowExecutor.schedule(new Runnable() {
			@Override
			public void run() {
				try {
					spawn();
				} catch (Throwable e) {
					Logger.handle(e);
				}
			}
		}, getCombatDefinitions().getRespawnDelay() * 600,
		TimeUnit.MILLISECONDS);
	}

	public void deserialize() {
		if (combat == null)
			combat = new NPCCombat(this);
		spawn();
	}

	public void spawn() {
		setFinished(false);
		World.addNPC(this);
		setLastRegionId(0);
		World.updateEntityRegion(this);
		loadMapRegions();
		checkMultiArea();
	}

	public NPCCombat getCombat() {
		return combat;
	}

	@Override
	public void sendDeath(Entity source) {
		final NPCCombatDefinitions defs = getCombatDefinitions();
		resetWalkSteps();
		combat.removeTarget();
		setNextAnimation(null);
		WorldTasksManager.schedule(new WorldTask() {
			int loop;

			@Override
			public void run() {
				if (loop == 0) {
					setNextAnimation(new Animation(defs.getDeathEmote()));
				} else if (loop >= defs.getDeathDelay()) {
					drop();
					reset();
					setLocation(respawnTile);
					finish();
					if (!isSpawned())
						setRespawnTask();
					stop();
				}
				loop++;
			}
		}, 0, 1);
	}
	
	public void drop() {
		try {
			Drop[] drops = NPCDrops.getDrops(id);
			if (drops == null)
				return;
			Player killer = getMostDamageReceivedSourcePlayer();
			if (killer == null)
			    return;
			Player otherPlayer = killer.getSlayerManager().getPartner();
			SlayerManager manager = killer.getSlayerManager();
			if (manager.npcIsTask(getName()))
			    manager.checkTaskCompletion(getDamageReceived(killer), otherPlayer != null ? getDamageReceived(otherPlayer) : 0);
			Drop[] possibleDrops = new Drop[drops.length];
			int possibleDropsCount = 0;
			for (Drop drop : drops) {
				/*List<Player> players = FriendChatsManager.getLootSharingPeople(killer);
				if (players == null || players.size() == 1) {
					sendDrop(killer, drop);
				} else {
					for (Drop lsdroppable : drops) {
						Player luckyPlayer = players.get(Utils.random(players.size()));
						Item item = sendDrop(luckyPlayer, lsdroppable);
						luckyPlayer.getPackets().sendGameMessage("<col=00FF00>You received: " + item.getAmount() + " " + item.getName() + ".");
						for (Player p2 : players) {
						    if (p2 == luckyPlayer)
							continue;
						    p2.getPackets().sendGameMessage("<col=66FFCC>" + luckyPlayer.getDisplayName() + "</col> received: " + item.getAmount() + " " + item.getName() + ".");
						    p2.getPackets().sendGameMessage("Your chance of receiving loot has improved.");
						}
					}
				}*/
				if (drop.getRate() == 100)
					sendDrop(killer, drop);
				else {
					if ((Utils.getRandomDouble(99) + 1) <= drop.getRate() * 1.5)
						possibleDrops[possibleDropsCount++] = drop;
				}
			}
			if (possibleDropsCount > 0)
				sendDrop(killer, possibleDrops[Utils.getRandom(possibleDropsCount - 1)]);
		} catch (Exception e) {
			e.printStackTrace();
		} catch (Error e) {
			e.printStackTrace();
		}
	}
	
	public void sendDrop(Player player, Drop drop) {
		int size = getSize();
		Item item = ItemDefinitions.getItemDefinitions(drop.getItemId()).isStackable() ? new Item(drop.getItemId(), (drop.getMinAmount() * 1) + Utils.getRandom(drop.getExtraAmount() * 1)) : new Item(drop.getItemId(), drop.getMinAmount() + Utils.getRandom(drop.getExtraAmount()));
		if (item.getId() == 995)
		    player.getInventory().addItemMoneyPouch(item);
		else
		    World.addGroundItem(item, new WorldTile(getCoordFaceX(size), getCoordFaceY(size), getPlane()), player, true, 60);
		/*for (String s : Settings.RARE_ITEMS) {
			if (dropName.toLowerCase().contains(s)) {
				World.sendWorldMessage("<img=6><col=ff0000>"+
						(player.getDisplayName())+" has recieved "+
							(dropName)+""+(item.getAmount() > 1 ? "s" : "")+" as a rare drop!", false);
			}
		}*/
	}

	@Override
	public int getSize() {
		return getDefinitions().size;
	}

	public int getMaxHit() {
		return getCombatDefinitions().getMaxHit();
	}

	public int[] getBonuses() {
		return bonuses;
	}

	@Override
	public double getMagePrayerMultiplier() {
		return 0;
	}

	@Override
	public double getRangePrayerMultiplier() {
		return 0;
	}

	@Override
	public double getMeleePrayerMultiplier() {
		return 0;
	}

	public WorldTile getRespawnTile() {
		return respawnTile;
	}

	public boolean isUnderCombat() {
		return combat.underCombat();
	}

	@Override
	public void setAttackedBy(Entity target) {
		super.setAttackedBy(target);
		if (target == combat.getTarget()
				&& !(combat.getTarget() instanceof Familiar))
			lastAttackedByTarget = Utils.currentTimeMillis();
	}

	public boolean canBeAttackedByAutoRelatie() {
		return Utils.currentTimeMillis() - lastAttackedByTarget > lureDelay;
	}

	public boolean isForceWalking() {
		return forceWalk != null;
	}

	public void setTarget(Entity entity) {
		if (isForceWalking()) // if force walk not gonna get target
			return;
		combat.setTarget(entity);
		lastAttackedByTarget = Utils.currentTimeMillis();
	}

	public void removeTarget() {
		if (combat.getTarget() == null)
			return;
		combat.removeTarget();
	}

	public void forceWalkRespawnTile() {
		setForceWalk(respawnTile);
	}

	public void setForceWalk(WorldTile tile) {
		resetWalkSteps();
		forceWalk = tile;
	}

	public boolean hasForceWalk() {
		return forceWalk != null;
	}

	public ArrayList<Entity> getPossibleTargets() {
		ArrayList<Entity> possibleTarget = new ArrayList<Entity>();
		for (int regionId : getMapRegionsIds()) {
			List<Integer> playerIndexes = World.getRegion(regionId)
					.getPlayerIndexes();
			if (playerIndexes != null) {
				for (int playerIndex : playerIndexes) {
					Player player = World.getPlayers().get(playerIndex);
					if (player == null
							|| player.isDead()
							|| player.hasFinished()
							|| !player.isRunning()
							|| !player
							.withinDistance(
									this,
									forceTargetDistance > 0 ? forceTargetDistance
											: (getCombatDefinitions()
													.getAttackStyle() == NPCCombatDefinitions.MELEE ? 4
															: getCombatDefinitions()
															.getAttackStyle() == NPCCombatDefinitions.SPECIAL ? 64
																	: 8))
																	|| (!forceMultiAttacked
																			&& (!isAtMultiArea() || !player
																					.isAtMultiArea())
																					&& player.getAttackedBy() != this && (player
																							.getAttackedByDelay() > Utils.
																							currentTimeMillis() || player
																							.getFindTargetDelay() > Utils
																							.currentTimeMillis()))
																							|| !clipedProjectile(player, false)
																							|| (!forceAgressive && !Wilderness.isAtWild(this) && player
																									.getSkills().getCombatLevelWithSummoning() >= getCombatLevel() * 2))
						continue;
					possibleTarget.add(player);
				}
			}
		}
		return possibleTarget;
	}

	public boolean checkAgressivity() {
		// if(!(Wilderness.isAtWild(this) &&
		// getDefinitions().hasAttackOption())) {
		if (!forceAgressive) {
			NPCCombatDefinitions defs = getCombatDefinitions();
			if (defs.getAgressivenessType() == NPCCombatDefinitions.PASSIVE)
				return false;
		}
		// }
		ArrayList<Entity> possibleTarget = getPossibleTargets();
		if (!possibleTarget.isEmpty()) {
			Entity target = possibleTarget.get(Utils.random(possibleTarget.size()));
			setTarget(target);
			target.setAttackedBy(target);
			target.setFindTargetDelay(Utils.currentTimeMillis() + 10000);
			return true;
		}
		return false;
	}

	public boolean isCantInteract() {
		return cantInteract;
	}

	public void setCantInteract(boolean cantInteract) {
		this.cantInteract = cantInteract;
		if (cantInteract)
			combat.reset();
	}

	public int getCapDamage() {
		return capDamage;
	}

	public void setCapDamage(int capDamage) {
		this.capDamage = capDamage;
	}

	public int getLureDelay() {
		return lureDelay;
	}

	public void setLureDelay(int lureDelay) {
		this.lureDelay = lureDelay;
	}

	public boolean isCantFollowUnderCombat() {
		return cantFollowUnderCombat;
	}

	public void setCantFollowUnderCombat(boolean canFollowUnderCombat) {
		this.cantFollowUnderCombat = canFollowUnderCombat;
	}

	public Transformation getNextTransformation() {
		return nextTransformation;
	}

	@Override
	public String toString() {
		return getDefinitions().name + " - " + id + " - " + getX() + " "
				+ getY() + " " + getPlane();
	}

	public boolean isForceAgressive() {
		return forceAgressive;
	}

	public void setForceAgressive(boolean forceAgressive) {
		this.forceAgressive = forceAgressive;
	}

	public int getForceTargetDistance() {
		return forceTargetDistance;
	}

	public void setForceTargetDistance(int forceTargetDistance) {
		this.forceTargetDistance = forceTargetDistance;
	}

	public boolean isForceFollowClose() {
		return forceFollowClose;
	}

	public void setForceFollowClose(boolean forceFollowClose) {
		this.forceFollowClose = forceFollowClose;
	}

	public boolean isForceMultiAttacked() {
		return forceMultiAttacked;
	}

	public void setForceMultiAttacked(boolean forceMultiAttacked) {
		this.forceMultiAttacked = forceMultiAttacked;
	}

	public boolean hasRandomWalk() {
		return randomwalk;
	}

	public void setRandomWalk(boolean forceRandomWalk) {
		this.randomwalk = forceRandomWalk;
	}

	public String getCustomName() {
		return name;
	}

	public void setName(String string) {
		this.name = getDefinitions().name.equals(string) ? null : string;
		changedName = true;
	}

	public int getCustomCombatLevel() {
		return combatLevel;
	}

	public int getCombatLevel() {
		return combatLevel >= 0 ? combatLevel : getDefinitions().combatLevel;
	}

	public String getName() {
		return name != null ? name : getDefinitions().name;
	}

	public void setCombatLevel(int level) {
		combatLevel  = getDefinitions().combatLevel == level ? -1 : level;
		changedCombatLevel = true;
	}

	public boolean hasChangedName() {
		return changedName;
	}

	public boolean hasChangedCombatLevel() {
		return changedCombatLevel;
	}

	public WorldTile getMiddleWorldTile() {
		int size = getSize();
		return new WorldTile(getCoordFaceX(size),getCoordFaceY(size), getPlane());
	}

	public boolean isSpawned() {
		return spawned;
	}

	public void setSpawned(boolean spawned) {
		this.spawned = spawned;
	}

	public boolean isNoDistanceCheck() {
		return noDistanceCheck;
	}

	public void setNoDistanceCheck(boolean noDistanceCheck) {
		this.noDistanceCheck = noDistanceCheck;
	}
	
	public boolean withinDistance(Player tile, int distance) {
		return super.withinDistance(tile, distance);
	}

	/**
	 * Gets the locked.
	 * @return The locked.
	 */
	public boolean isLocked() {
		return locked;
	}

	/**
	 * Sets the locked.
	 * @param locked The locked to set.
	 */
	public void setLocked(boolean locked) {
		this.locked = locked;
	}
}
Addition: Ranged/Mages seem to have to go close to an NPC in order to attack them, no idea why.