There's a few mobs in the game that purely spawn as a visual timer counting down to let you know when a named will spawn (Eg that Nottap Ekim from PoSky). My guess is this mob spawns after the Guardian of the Seal dies as some kind of timer. How to use him to tell when the Guardian will be back, I don't know.
You can't cast on him at all, it just says "your spell did not take hold." So I'm guessing its impossible to attack him. As for that g-flux bit, g-flux doesn't throw you in the air anymore, they nerfed it...
This guy spawns after Guardian of the Seal has been slayed. It's not quite immediete, but he'll pop within a few minutes afterwords.
It's kinda earry. He just sits there and watches the door like he's expecting Mrs. Yael to be waltzing right through shouting, "Oh Mr. Yael, you forgot your cookies!". At this point, his name changes to Notsodormantanymore Watcher and proceeds to quad and flurry away for quadrupal digits and a death message of, "The cookies are mine, biosh!".
Hmm, I got carried away.
You can actually open the door while Guardian of the Seal is there using a Mage/Wizard's Eye of Tallon. Of course, it's even more funny when people get stuck back there and "click" the door, thinking Guardian doesn't quite know you're there. Hmm, what's this knocking at my door? Doesn't look like anything to me!
This guy was not up at first, but after we killed the Guardian he appeared which surprised the raid. Can be targeted but you cant cast spells on him. One thing though, the door that the Guardian was in front of. Though it could be opened before after you kill the Guardian it becomes locked and this guy spawns staring down at the door.