A harmful status condition which, in PVP/GVG, causes all enemies to be made invulnerable to your attacks and friendly players to become vulnerable. This means you can't attack enemies but can attack those you normally couldn't attack. In PVE/PVM it makes it so you cannot attack monsters.
Resistance can be gained (up to 50%) through increasing INT. No items currently exist to resist it, but they are planned.
+1/+2 Restoration Elixirs will protect against it and all other status conditions for a short time.