Black Mana Gambit (The Calamitous Bob, #6)

Viv is dying. Her mana, her strongest tool, is turning against her. She only has months left before it finishes devouring her, but not all is lost. The powerful resident archmage of the magical city of Helock promises her salvation. Viv merely needs to gather a few things and run a few errands. Simple, right? Yet the final price might be higher than she expected. Helock is a den of vipers. Forces move on the border while her paramour, Sidjin, is caught by his past. She will have to navigate those dangers if she wants to be reborn part elemental, the only way for her body to contain her magic.

It would be nice if she could graduate as well.