A male Warrow who was the husband of Raven Greylock, and the son-in-law of Tuck Underbank. Willen assisted his wife in the compilation of what would eventually be the Raven Book, and accompanied her to the Cliffs with the original copy of Tuck's diary.

His descendants and relatives include the Underbanks, Fletchers, Greylocks and Fairhills. One noteworthy family member is Peregrin Fairhill, a historian who helped in the reclamation of Kraggen-Cor.