#and I'm like Callum should do a magical pose too coz he's a mage and he needs a staff to do that

[chimpukampu]

I don't know if this is a popular theory or not but I think Phoe Phoe's feather could be a Primal Source for Callum to do moon magic in S4 onwards

I also have doubts that Callum will be able to connect to another arcanum, though I'm sure he'll be able to do other spells aside from Moon and Sky.

Maybe Callum isn't gonna be an Avatar-like who will forge connections to all arcanums. Maybe he'll end up collecting Primal items (similar to primal stones) which will allow him to fight Aaravos equally.

And maybe he'll put these primal items in a staff and maneuver it like other magical heroes do.

Like Sailor Moon, for example.