There's always good old ass-kicking.
If you still have to design your mage, but expect a lot of vampire conflict, go full combat monster. It's not widely recommended but you can make a mage close quarters specialist that's rolling 20+ dice of aggravated damage quite easily.

Take Following:
-Physical Primary + Nephilim Merit (or genemods)
-Martial skills + specialty
-Arete 3, LIfe 3+Spirit 3
-Specialized tool to make Fetishes even with spirit 3. Werewolf Paw amulet, anti-magic amulet.

Make a bunch of short term talens & Fetishes to arm...