Hello,
Firstly, I am posting this here because the crash report I got says to contact the coremod authors first. Also, I am not sure that this mod has anything to do with the crash, but better safe than sorry. That said, here is what happened:

Leading up to the crash, I am trying to place maps inside of Bibliocraft Map Frames. However, it seems as though just holding the map can cause the crash. My crash report can be found here.

I will also be posting this with the authors of the other coremods I have installed just in case.

It is impossible for the Forgelin core mod to cause this crash, as the core mod does nothing.