Miscellaneous setup

src/main/java/electroblob/wizardry/potion/ICustomPotionParticles.java

@@ -1,6 +1,10 @@
 package electroblob.wizardry.potion;
 
+import net.minecraft.potion.PotionEffect;
 import net.minecraft.world.World;
+import net.minecraftforge.event.entity.living.LivingEvent.LivingUpdateEvent;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
 
 /**
  * Interface for potion effects that spawn custom particles instead of (or as well as) the vanilla 'swirly' particles.
@@ -8,6 +12,7 @@ import net.minecraft.world.World;
  * @since Wizardry 1.2
  */
 // TODO: Backport.
+@Mod.EventBusSubscriber
 public interface ICustomPotionParticles {
 	
 	/**
@@ -20,4 +25,21 @@ public interface ICustomPotionParticles {
 	 */
 	void spawnCustomParticle(World world, double x, double y, double z);
 
+	@SubscribeEvent
+	public static void onLivingUpdateEvent(LivingUpdateEvent event){
+		if(event.getEntityLiving().worldObj.isRemote){
+			// Behold the power of interfaces!
+			for(PotionEffect effect : event.getEntityLiving().getActivePotionEffects()){
+
+				if(effect.getPotion() instanceof ICustomPotionParticles && effect.doesShowParticles()){
+
+					double x = event.getEntityLiving().posX + (event.getEntityLiving().worldObj.rand.nextDouble() - 0.5)*event.getEntityLiving().width;
+					double y = event.getEntityLiving().getEntityBoundingBox().minY + event.getEntityLiving().worldObj.rand.nextDouble()*event.getEntityLiving().height;
+					double z = event.getEntityLiving().posZ + (event.getEntityLiving().worldObj.rand.nextDouble() - 0.5)*event.getEntityLiving().width;
+
+					((ICustomPotionParticles)effect.getPotion()).spawnCustomParticle(event.getEntityLiving().worldObj, x, y, z);
+				}
+			}
+		}
+	}
 }

src/main/java/electroblob/wizardry/potion/PotionDecay.java

@@ -1,8 +1,12 @@
 package electroblob.wizardry.potion;
 
+import java.util.List;
+
 import electroblob.wizardry.Wizardry;
 import electroblob.wizardry.constants.Constants;
+import electroblob.wizardry.entity.construct.EntityDecay;
 import electroblob.wizardry.util.WizardryUtilities;
+import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.SharedMonsterAttributes;
 import net.minecraft.potion.Potion;
@@ -32,8 +36,25 @@ public class PotionDecay extends Potion {
 	}
 	
 	@Override
-	public void performEffect(EntityLivingBase entitylivingbase, int strength) {
-		entitylivingbase.attackEntityFrom(DamageSource.wither, 1);
+	public void performEffect(EntityLivingBase target, int strength) {
+		
+		target.attackEntityFrom(DamageSource.wither, 1);
+		
+		if(target.onGround && target.ticksExisted % Constants.DECAY_SPREAD_INTERVAL == 0){
+
+			List<Entity> entities = target.worldObj.getEntitiesWithinAABBExcludingEntity(target, target.getEntityBoundingBox());
+
+			boolean flag = true;
+
+			for(Entity entity : entities){
+				if(entity instanceof EntityDecay) flag = false;
+			}
+
+			if(flag){
+				// The victim spreading the decay is the 'caster' here, so that it can actually wear off, otherwise it just gets infected with its own decay and the effect lasts forever.
+				target.worldObj.spawnEntityInWorld(new EntityDecay(target.worldObj, target.posX, target.posY, target.posZ, target));
+			}
+		}
     }
 	
 	@Override

src/main/java/electroblob/wizardry/potion/PotionFrost.java

@@ -2,6 +2,7 @@ package electroblob.wizardry.potion;
 
 import electroblob.wizardry.Wizardry;
 import electroblob.wizardry.constants.Constants;
+import electroblob.wizardry.registry.WizardryPotions;
 import electroblob.wizardry.util.WizardryParticleType;
 import electroblob.wizardry.util.WizardryUtilities;
 import net.minecraft.entity.EntityLivingBase;
@@ -10,9 +11,13 @@ import net.minecraft.potion.Potion;
 import net.minecraft.potion.PotionEffect;
 import net.minecraft.util.ResourceLocation;
 import net.minecraft.world.World;
+import net.minecraftforge.event.entity.player.PlayerEvent.BreakSpeed;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
 import net.minecraftforge.fml.relauncher.Side;
 import net.minecraftforge.fml.relauncher.SideOnly;
 
+@Mod.EventBusSubscriber
 public class PotionFrost extends Potion implements ICustomPotionParticles {
 	
 	private static final ResourceLocation ICON = new ResourceLocation(Wizardry.MODID, "textures/gui/frost_icon.png");
@@ -50,4 +55,12 @@ public class PotionFrost extends Potion implements ICustomPotionParticles {
 		WizardryUtilities.drawTexturedRect(x + 3, y + 3, 0, 0, 18, 18, 18, 18);
 	}
 
+	@SubscribeEvent
+	public static void onBreakSpeedEvent(BreakSpeed event){
+		if(event.getEntityPlayer().isPotionActive(WizardryPotions.frost)){
+			// Amplifier + 1 because it starts at 0
+			event.setNewSpeed(event.getOriginalSpeed() * (1 - Constants.FROST_FATIGUE_PER_LEVEL*(event.getEntityPlayer().getActivePotionEffect(WizardryPotions.frost).getAmplifier() + 1)));
+		}
+	}
+
 }