Added EntityEnderCrystal for diff visibility.

src/main/java/net/minecraft/server/EntityEnderCrystal.java

@@ -0,0 +1,63 @@
+package net.minecraft.server;
+
+public class EntityEnderCrystal extends Entity {
+
+    public int a = 0;
+    public int b;
+
+    public EntityEnderCrystal(World world) {
+        super(world);
+        this.bf = true;
+        this.b(2.0F, 2.0F);
+        this.height = this.length / 2.0F;
+        this.b = 5;
+        this.a = this.random.nextInt(100000);
+    }
+
+    protected boolean g_() {
+        return false;
+    }
+
+    protected void b() {
+        this.datawatcher.a(8, Integer.valueOf(this.b));
+    }
+
+    public void y_() {
+        this.lastX = this.locX;
+        this.lastY = this.locY;
+        this.lastZ = this.locZ;
+        ++this.a;
+        this.datawatcher.watch(8, Integer.valueOf(this.b));
+        int i = MathHelper.floor(this.locX);
+        int j = MathHelper.floor(this.locY);
+        int k = MathHelper.floor(this.locZ);
+
+        if (this.world.getTypeId(i, j, k) != Block.FIRE.id) {
+            this.world.setTypeId(i, j, k, Block.FIRE.id);
+        }
+    }
+
+    protected void b(NBTTagCompound nbttagcompound) {}
+
+    protected void a(NBTTagCompound nbttagcompound) {}
+
+    public boolean e_() {
+        return true;
+    }
+
+    public boolean damageEntity(DamageSource damagesource, int i) {
+        if (!this.dead && !this.world.isStatic) {
+            this.b = 0;
+            if (this.b <= 0) {
+                if (!this.world.isStatic) {
+                    this.die();
+                    this.world.a((Entity) null, this.locX, this.locY, this.locZ, 6.0F);
+                } else {
+                    this.die();
+                }
+            }
+        }
+
+        return true;
+    }
+}