Considering the staffs lore had it opening portals that let demons flood through my kneejerk would be that, but that sounds awfully like something they should give demo so iono.
I'm kinda curious why devourer of life is on there, just seems out of place since its not a spell destruction should be using much if at all.
Eh anyway destructions looking good to me so far. Keeping that jack of all trades and smoothing out the RNG on our mastery is nice.