I've had a Mage the entire game and it's never evolved into the next class. I'm sure it's the INT stat being to low, but god damn. Not that I"m missing them, I think the Mages are rather terrible in this game.
https://i.imgtc.com/hQ5SuG6.gif https://i.imgtc.com/QrhAq36.gif https://i.imgtc.com/Yjov9DU.gif