You place your hand on the weapon, and it begins to rumble quietly, as though a booming thunderhead is contained within.

Encounter   ✦     Arcane, Thunder
Minor Action      Melee 1

Target: One weapon

Effect: Until the end of your next turn, the next weapon attack made with the target weapon deals 2d6 thunder damage to one target of the attack, regardless of whether the attack hits or misses.

Published in Heroes of the Feywild, page(s) 61.