Fuck.
Okay... Ahh... hrm... well, I'll adapt then. How about this? Better raw stats and more interesting offensive powers in exchange for versatility. By killing strong opponents he buffs his buddies offensively and makes it harder for his foes to escape. In addition, being a scary motherfucker is perfectly explainable.
Reaver Lord[Axes] His terrifying presence on the battlefield strikes fear into the hearts of his foes while inspiring his allies. Few can escape him.
Sunder: Felling a defending promoted opponent reduces nearby opponents' mobility from the sheer brutality of their friend/ally's death. The effect is greater on mounted units (The animal is freaked out) but nonexistant on heavy armored units (Can't see shit past ten feet).
Rally Assault: Felling a defending promoted opponent raises Strength, Speed, Magic, and Skill by 3 for all nearby allies temporarily, as the particularly gruesome manner in which his foe was dispatched eases their fears.
Armored, takes doubled damage from magic. High (though not exceptional, he won't out-punch berserkers or out-notdie generals) Strength, defense, and HP. Average skill, luck, and mobility(6). Below average speed and resistance (compounded by the doubled damage).
Cannot use ranged axes.
Nerendier said
This might seem like a dick thing to say, but why not: instead of trying to make characters with interesting abilities, make characters who are interesting.
Then don't say it, Heretic.