I believe I isolated it. Flavour start option. Worked fine without, try it yourself =)
EDIT: There seems to be more to it. Research continues.
UPDATE: 3 villains confirmed among options
Flavour Start
Aggressive AI
Combat Log
Now I will reward myself with playing. Actually, if anyone else wants to check further things, I might aswell mention working ones for now.
No Tech Brokering, Lock Modified Assets, New Random Seed on Reload, No Vassal States, Living World, No World Spells.
Keep up the good work, there can never be too many options of doom for a world.
UPDATE: Smoke seems to block the forest munching and cause tears to be held for a lot longer than otherwise. Accidently had myself 3 get stuck in a smoke forest and they kept producing Digesting Tears for some 80 turns.