White Moon
Class: Rogue
Level: 70
Location: Maso sanctum (Buya rogue's guild)
Items in inventory: Whisper bracelet (possibly 2)
Sacrifices: 20,000 coins
Rewards: White moon axe

1) Go to Maso sanctum.  Ask the guildmaster about the white moon.
2) He will tell you his story.  If he tells you your wrists are bare and you're wearing your whisper bracelets, remove them and repeat step one (not sure if the bug is fixed yet).
3) As he instructs, slay five pale scorpions (the white ones in the spider cave).
4) Return, he'll instruct you to slay the Ju skeleton.  You will find him in the black skeleton cave with Je Ja. He is one of the very dark ones.
5) Return again with 20,000 coins (so you won't have to go grab it after he asks).
6) He will take the money and give you a White moon axe.