I want this ability for a WoW warrior so badly. This isn't Whirlwind, which only hits four mobs (although yes, if you are geared enough Whirlwind will effectively insta-gib four non elite mobs on a crit) but rather basically a full fledged clear the room ability. I've wiped out entire caves full of Darkspawn with this move. I understand that it would be ridiculously OP for an MMO and that in the name of game balance I shouldn't have it. I mean, imagine world PvP against a warrior who can insta-kill everything lower level than he is in the area? Crossroads and Tarren Mill/Southshore would be charnel pits of dead lowbies. But man, I still wish I had this move.
So what spells, abilities, special moves, or other cool features would you like to steal from other games for your WoW enjoyment?