There'll be a mad dwarf hermit NPC* in the next game I'm GMing. Originally, he was to be some monster reskinned, but the Daily power where you become a frost monster thing fit his MO too well for him to be anything but a Warden. If I remember, I might post about how he plays out, whenever we play again.
*I had to make some educated guesses about NPC Wardens, but the same has been true about NPC Artificers, Barbarians and Swordmages before the FRPG came out. They all worked out okay, more or less.