Dark Sun: Grave Burden II
Cloak of Elvenkind
This neutral-grey cloak is inconspicuous-looking, but when worn, the cloak can be activated by the wearer to take on his surroundings. When the cloak’s power is in use, the wearer seems to blend in with the features around him as a steady mirage cakes over a heated horizon.
The cloak of elvenkind was created by elves, likely those that trade in Balic. The cloak is a telepathic psionic item, and so the wearer can activate the cloak mentally.