The Gauntlet of Torm

Part of the suit of armour of an ancient champion
of Torm, this silver-inlaid gauntlet holds a
fraction of it's power.
•While attuned to this gauntlet, you know
the cantrip Storm Mantle.
•Once on each of your turns when you hit a
creature with a weapon attack, you can cause the
attack to deal an extra 1d8 thunder damage to the
target.