Found on the second level of the caverns under the temple of Nerilous. Session 4.

Item Slot: Arms

Property: When you score a critical hit, the target takes 1d6 extra fire damage.

Power (Daily): Minor Action. The next time you hit with an attack, the target takes 1d6 extra fire damage.

Published in Adventurer’s Vault, page(s) 117, Heroes of the Forgotten Kingdoms, page(s) 349.