I personally would like to BURN WITCHES, but, unfortunately, crpg doesn't have any.
Battlemode should have a witch appear for a round (a randomly selected player) once every few hours. It'd work like a juggernaut, where the witch would have ridiculous speed, strength, and also be completely rogue (able to attack either team). Maybe some kind of black robe and hat would be in order too, but that's all aesthetics.
The witch would ride dat brilliant 10 ex until someone ended the spree. The witch's slayer would be awarded premium bankage and dosh.