val addObjectRaw = classOf[FMLControlledNamespacedRegistry[Block]].getDeclaredMethod("addObjectRaw", classOf[Int], classOf[String], classOf[Object])
val id = Block.getIdFromBlock(Blocks.ice)

addObjectRaw.setAccessible(true)

addObjectRaw.invoke(GameData.getBlockRegistry, id: Integer, "minecraft:ice", BlockSTIce)
addObjectRaw.invoke(GameData.getItemRegistry, id: Integer, "minecraft:ice", new ItemBlock(BlockSTIce))
val ice = ReflectionHelper.findField(classOf[Blocks], "field_150432_aD", "ice")
ReflectionHelper.setPrivateValue(classOf[Field], ice, ice.getModifiers & ~Modifier.FINAL, "modifiers")
ice.setAccessible(true)
ice.set(null, BlockSTIce)