I'm not going to bother with support on this one. It's too obvious that you have some cheaters in your game. xAlivex, Evolution, Mr_Sword, and countless other members of Hubris at least that we suspect for now. It's enough to warrant an investigation into these players. We weren't expecting it before, so unfortunately, we didn't have the set up to record it, but a reaper stood between two guilds, taking all the horrendous amount of focus fire that would cause a single player not being healed to be absolutely demolished in pvp, and he wouldn't even lose mana. We couldn't even mana drain A REAPER. There is nothing about his stat line to suggest that he could even take that amount of damage, and the combat log will register that they're taking crazy amounts of damage, and yet still, their health seems almost impossible to even move from full.
This is beyond game breaking, when one player can walk into a fight against anyone he wants, and beat them all purely because no one can hurt him.