Ioun Stone of True Sight
This dark blue rhomboid stone floats lightly in the air, granting you darkvision and greatly enhanced insight and perception.
Head Slot 2,125,000 gp
You gain darkvision and a +6 item bonus to Insight checks and Perception checks.
Power Daily (Minor Action)
Until the end of your next turn, you can clearly see creatures and objects within your line of sight, even if they are invisible or obscured.Sustain Minor: The effect persists until the end of your next turn.
Published in Player's Handbook, page(s) 249, Dungeon Master's Kit, page(s) 266.