Doomwyte - Brian Jacques

The Redwallers face some of their most dangerous villains yet in a treacherous hunt for long-lost treasure.
The young mouse Bisky persuades his friends at Redwall Abbey to seek a fabled treasure--the jeweled eyes of the Great Doomwyte Idol--only to lead them into the realm of the fearsome Korvus Skurr, the black-feathered raven.