Also available in F2P!
EDIT: WTF?! The cap is level 120 and it's a group skill in a "safe", instanced dungeon?!
It looks interesting, certainly.
I'm gonna go try it out with some members of my clan (http://www.wildernessguardians.com) tonight.
Well, after having played with it a bit... It's a monsterous, (30+ min for a single round.) multiplayer minigame disguised as a skill...
If it wasn't for some decent rewards, I doubt there'd be much interest...