Forge version: forge-1.12.2-14.23.0.2512
Twilight Forest version: 1.12.2-3.1.128
Link to crash log: https://gist.github.com/phit/2349bd8317fe7ebbaeb7445a5b876ec5

Steps to reproduce:

1. no clue, supposedly something with the lich boss, also maybe related to spongeforge

to quote the player: "soo i was in the twilight forest castle thing and the lich spawned and the server crashed - sorry if that was me! v.v"

couldn't get it to happen locally but whatever the fix is simple

just tested with the dev build (1.12.2-3.1.151), did indeed fix it! thanks