Thanks! In short: For WoD (ctd): He is a sidhe from a long-forgotten seelie House, stripped of titles and doomed to eternal wandering in the Fog. He serves the Misty Lady and helps those lost in a The Dreaming find their way home.

For DnD: he is a winter eladrin, a paladin/warlock, who plays the same role as an assistant to the lost. I'm sorry for my English, I hope I didn't make a mistake in the translation.