So I attempted to add FeyWild to a mod pack, it results in a crash every time a single player world is created. Attached is the crash log. The Error code for the game crash is " The game crashed whilst mouseclicked event handler
Error: java.lang.NoSuchFieldError: FEY_GEM_BLOCK
Exit Code: -1"

Not sure if it is mod interaction or what but hope this helps
LFP T2 - Fey Wild upload -1.7.10.zip

crash-2021-08-23_20.00.08-client.txt

Thanks for reporting.
We dont use the annotation FEY_GEM_BLOCK in the new version
com.thevortex.allthemodium.worldgen.miningdimension.Feytures
Does allthemodium mod add the block?

They made an update for that:
https://www.curseforge.com/minecraft/mc-mods/allthemodium/files/3437133