What version of More Mystcraft are you using?
0.5.4

What version of Mystcraft are you using?
0.13.7.03

What version of Forge are you using?
14.23.5.2836

What version of Minecraft are you using?
1.12.2

What modpack and modpack version are you using, if any?
None

Does the bug occur server-side, client-side, or both?
Client-side

Paste a link to your log or crash report here. Use a service like pastebin. No images, please.
https://pastebin.com/E3xJc3ce

Describe the bug
Crash with the latest Mystcraft version,

To Reproduce
Steps to reproduce the behavior:
Install both Mystcraft and more mystcraft

Expected behavior
Game to load?

Additional context
Temp Solution - Rollback to Mystcraft 7.02

There was a method in Mystcraft that has become unobfuscated. Things should work normally in the now-released next version unless something else is found.

https://minecraft.curseforge.com/projects/more-mystcraft/files/2699797

Mystcraft added some generation changes with the newest release, and More Mystcraft will be incompatible until those changes are reconciled.