Something with deadly module it seems is crashing server on startup, removing this mod lets everything load up fine
Crash log: https://gist.github.com/ShootToKillSTK/34a72ea6bf5be6b874391e82a2a8bfd9

Version of mod: 1.16.5-4.8.2
Tried with default configs too + no datapack (If that matters)

this is a mohist problem.