Tales and Chronicles
Jewel of the North, formerly know as vincegetorix
Given the low-power/low-magic feel of the setting, I guess its the same reasoning that why they didnt make stat for Gandalf: the party is not supposed to engage a Nazgul with chances of surviving. Its one of the thing that bothers me with AiME: if you read Adventures in the Wilderland, many questlines are made so the PC cant win and must flee or be saved by a deus ex machina, and you cant really ''kill'' the endboss, you only ask a powerful NPC to finish it or delay its plans for a couple years.