Background summary: The teams (Benevolent Order of the Overseer BOO, and Sentinels Infernal Nation SIN) were given a skin at the start of the event, promised that it would be taken away at the end of the event should they lose to their counterpart.
After a glitch-fest of a event, the mods declared SIN victories, though story-wise both teams were beaten by Jack, the Halloween demi-god, who took the powers from both armies' leader.
After it's defeat, BOO's skin was NOT taken away, it was turned into the Potatoverseer (name which suggests that it was designed long before the event ended).
It's widely hated and thought of as unfair by members of both teams. It is bald, shit-brown, crying, has worms coming out of its skull; overall an abomination, total utter garbage. It can't be removed from ones inventory.
This is the way Gaia rewards the ones who take the side of good, learning us all a lesson that you should just join the cool demon-chick instead of protecting the innocent. Real nice Gaia, real nice... -.-
The reason it is a potato-skin, is vaguely explained in the pre-event manga, where an NPC chokes on a potato, presumed dead, Sentinel removes it and "revives him". The NPC is killed off again at the end of the event as well, HOWEVER, he was on the side of SIN throughout the event.
Gaian #2: Yeah, Gaia really screwed up there. A muddy, crying, bald, potato-skin...
Gaian #3: This is the way Gaia rewards the ones who take the side of good, learning us all a lesson that you should just join the cool demon-chick instead of protecting the world from being overrun by chaos and desruction. Real nice Gaia, real nice... -.-