@TheDragonOfFlame Every now and then I see an anti-mage class and think "Okay, I have no idea how to analyze this - it's like an anti-goblinoid class or an anti-demon class." Might it be plausible to make half the powers anti-mage and half the powers life-based? Things like healing, animating, tree-magic, something like that?
Note that clerics, druids, and anyone else will be turned by Turn Magi - including the "mages who draw power from the World Tree" implied by the oath description.
I don't know if this subclass would be meant for players or for NPC mage-slayers - I know I wouldn't pick…