Lamp of Discerning
This plain-looking lantern grants those in its light the ability to see through deception.
Wondrous Item 1,000 gp
This lantern sheds light in a 10-square radius as normal, but it never needs lighting or refilling. You and all allies within the area of illumination gain a +1 power bonus to Insight and Perception checks.
Published in Adventurer's Vault, page(s) 174.