Board Thread:General Mod Discussion/@comment-25101089-20170524114315/@comment-25101089-20170527015222

Resource packs are not coremods, neither are replaced class files. A coremod is a specific technique which uses the ASM library to alter something else's compiled bytecode.

Are you just saying that you replaced some of the mod's class files? Because if so, there is still no reason why the mod's coremod would be affecting that. The coremod does not alter LOTR mod code at all (because that would be pointless), so any modifications to the LOTR mod code will not affect the functioning of the coremod.