Orb of the Darkmoon

Orb of the Darkmoon is an necklace that that gives bonuses to stamina, spirit, and spell power.

Source
This item is a quest reward for the Darkmoon Faire ticket turn-in quest

To get the this item, you need to turn in your tickets to Gelvas Grimegate.

RPG
"An iridescent blue stone sits nestled in a round silver amulet. The heavy silver chain seems tarnished, and no amount of polishing brightens it. Though beautiful, the swirling depths of the blue stone carry a hint of menace."