Relics version 0.8.0.2
Forge 47.3.5

I have tried with every other relics and only these 2 caused a crash

logs

Basically, to fix this issue, you may just switch from Forge to NeoForge (which is recommended since all Relics' tests were made on NeoForge only). But if you want to keep Forge, you can join our Discord (and tag me in any channel), and I'll provide you a build with potentially fixed compatibility to be sure that it works fine on Forge too now.

Should be fixed now.