Hard. Level 80 zerker, not much in the way of defensive stuff (probably around 30 shielding, 50 avoid, 4 ca/cs), hit me for 4895 max. Reactive j1 merc couldn't even come close to keeping up with heals, I dropped like a nuke-happy wizard.
If you're not an uber, make sure you bring a tank.
~Anothersoldier (Xegony)