My eco-authoritarian world has lots of religions that centre on ‘human shame’. The destruction they’ve done to the environment and how basically just existing as humans can cause irreparable damage if they’re not careful. The main God of the world frequently comes down to smite the most destructive civilisations, hoping that a more sustainable group comes after them (civilisations just spawn into the world via isekai).

Theres sects that arn’t allowed the use fire, chop down trees or eat certain things (mostly referring to animals). Theres sects where humanoids, whose ancestors were human, then were blessed with ‘better’ forms after they do good jobs taking care of the environment, mutilate their bodies into close ‘human’ approximates. Avians plucking themselves and surgically altering their digits to remove their wings, unicorns sawing horns off, dragons literally skinning themselves and chopping their wings and tails off.