Femboy Fantasy Tit Tacs
I really thought slamming my way through Tactics Ogre would prep me for this. I'm only like eight hours in and already I have underlevelled characters I can't do anything with. I haven't even started messing with classes yet, please help. Save me, training battles.
Also why team size so small 
EDIT: Why are black mages evil. Ranged lockon fire attack that kills you.
EDIT2: the best strat for black mages is kamakaze basically. They have a lot of range and can snap to targets freely, so running next to another enemy will result in their multi target fire killing one of their boys.
Oracle. Use the ying yang magic for silence or lower their faith to the point they become atheist and magic does zero damage.
What if I have none of that cuz this is my first encounter with a black mage :>
You could try just ganging up on them, they're quite squishy. Also good for early game is to have a female thief who can charm male units since most characters in the game are male.
I have four guys there is no ganging up
good to know about fem thieves tho.