Aridha's mechanics are pretty easy. She can swing a scimitar, cast spells, or turn into big scary animals twice per short rest.![]()
Yeah, but a barbarian multiclass needs Str 13 to do, and Aridha has Str 8, cuz she's just a wee lassie.
As for AC, by my reading I'd be able to use either the Barbarian Uarmored Defense AC, OR the animal AC. They wouldn't stack. I'd have to pick whichever one was better.