Find the Sword of P0wnz0r in basement level nine of Castle Mega-Evil where it is guarded by something really, really nasty. Fight your way back out, kill the Final Boss (tm) and save the world!
Discover wonders such as the Flail of Ultimate Threshing, Epic Boomstick and Bathrobe of Necromancy!
Defeat the Zombie Viking Ninja Pirate, the Wizard With No Friends, the Drunk Depressed Boring Guy, and dozens more!
Also, levels, XP, Mad Loot, what more could you want? DEPTH!?