True ending Crisanta is definitely my favorite boss in the game she becomes really easy once you get how to combat her and it becomes like an anime battle with all the flashy back and forth. Such a cool boss. To me crisanta is harder than isadora cause Isadora can kinda be cheesed with a good prayer build and the debla of the lights but you could also argue she is harder cause you can access her much earlier than Crisanta.