Undead Bone

What drops it

 * Ancient Statue
 * Chained Cleric
 * Evil Corpse
 * Skeletal Hound
 * Skeleton Priest
 * Skeleton Illusionist
 * Zombie Brute

General collectors
===Festival collectors
 * You could exchange these for various party, alcohol, and sugar items during the Farewell to Gaile event in 2008.