Crash log:
Architectury (architectury) encountered an error while dispatching the net.neoforged.fml.event.lifecyole.FMLCommonSetupEwent event
javalang.NoClassDefFoundError:
it/hurts/ootostudios/octolib/modules/config/impl/0ctoConfig

OctoLib updated to latest, Relic (and addons) also updated.
Mods from SSKirillSS installed: Reliquified Twilight Forest, NERB, Relics: Artifacts, Relics, OctoLib, Cardiac, Curios API continuation.

Getting this crash too, was able to backport relics to 0.10.7.6 without issue with octolib at 6.0.0.3. Relics 0.11.0.0 seems to crash though with latest octolib.

Don't use 0.11 if you want addons.

Same here.

Had to revert octolib back to 0.5.0.1 on my end and refrain from updating all relic mods.