Watchful EyeLevel 12 Uncommon

Taking the form of some lesser gem in the eye socket of an idol, or just stuck in the middle of a wall, this spy reports all that it sees back to its master.

Wondrous Item        13,000 gp

Property

When a creature enters this eye's line of sight, the eye telepathically warns you of the creature's presence and provides a description, as long as you are on the same plane as the eye.

Published in Adventurer's Vault 2, page(s) 83.