It's a Yugioh reference involving the Seal of Orichalcos. I dunno if YGOTAS aired that part, but it puts the seal on your forehead and gives your eyes a red tint.
It does look like possession now that I look at it.
I could always try that if I can't find a Reuniclus one. I do have an idea for a Christmas-y avatar, but it will probably look cheesy. Maybe I can try to find a Reuniclus dressed as the Grinch.