Clue scroll (elite) reward and bought at the Grand Exchange.
Uses:
Works like a Mystic earth staff with additional Summoning, Defence and Prayer bonuses. A special emote can be performed if worn in conjunction with the wolf mask.
Notes:
You can perform the emote through your Equipment menu if you have the mask and staff both equipped. Needs 40 attack, 40 magic, 20 defence, and 60 prayer to be wielded.