So, I removed Breed anyone and Skill Descriptions from mods, the game started working fine.
Yeah, Skill Descriptions also the problem, didn't notice last time. Here's the error with Skill Desc. enabled:
SCRIPT ERROR: Invalid call. Nonexistent function 'duplicate' in base 'String'.
at: createfromskill (res://src/classes/short_skill.gd:68)
SCRIPT ERROR: Invalid get index 'icon' (on base: 'Nil').
at: convert_to_new_template (res://src/classes/short_skill.gd:112)
SCRIPT ERROR: Invalid get index 'ability_type' (on base: 'Nil').
at: translate_skill_descript (user://mods/ConquestTweaks/tw_skill_desc/skilldesc.gd:298)