CoreMod

一般認為通過實現IFMLLoadingPlugin註冊IClassTransformer在運行時修改類字節碼的mod為coremod。其他類似接口如ITWeaker也算在此類。高版本一般為實現特定service（如高版本Forge的ITransformationService等）

Mods that modify class bytecode at runtime using IClassTransformer registered through IFMLLoadingPlugin are recognized as coremod. Other interfaces like ITweaker applies too. In high versions it's more common to implement such services like ITransformationService as for Forge.