Looking at my copy of Our World right now, and I don't see a stat-block for him...I apologize if I missed it.
Basically, one of the characters in a campaign I'm working on is being built on the Emissary of Power template. His patron is the Erlking, who gave him a scarlet cloak which bestows a set of powers (Inhuman Speed, Inhuman Strength, a couple others). The catch is that the Erlking only did this so that he would have someone interesting to hunt; in other words, he was bored. The character is only permitted to keep the cloak (and his life) as long as he can avoid being caught by the Erlking. In addition, use of the cloak acts as a sort of homing beacon, drawing the Erlking in to its location.
"Emissary of Power" is probably a misnomer for this sort of thing, but it seemed the best term in the book.
In any case, my problem is that I am not sure how best to stat the Erlking himself. Obviously he has the usual Fae weakness to iron and such, but beyond that, what would you guys suggest I look at?