Looking for Creature Overhauls

I've been looking for creature AI, creature overhaul and even mods that change creatures attack pattern. I checked our Distar's draugr but it seemed incompatible (or I just did not patch it correctly) with the other OAR mods that I have so I had to give up on it. Can anyone comment down their overall creature overhauls? Preferably, those creature mods that make the game more challenging with AI and attack pattern. Thank you!