What in the world is an arena death match?

[Poopsi]

it´s a competition of sorts. you select a hero (or even better, an hero-give him a medallion of vengeance) and send him over. If he loses he dies. If he wins he has to fight every time. You get a lousy trident as a prize, I think the biggest point in sending someone there is to give him a chance to kill some good enemy heros.

[K]

The "winner" also gets a pile of XP on top of his kills, so usually he gets into the Hall of Fame and gets a Heroic Quality (orange XP stars with extra powers for the unit).