Force Gauntlet (5e Equipment)
From D&D Wiki
Martial Melee Weapons
"A Gauntlet imbued with the power of a weak force stone."
Trick: This weapon can be activated as a bonus action.
Force Strike: This Gauntlet is embedded with a force element stone in the palm. By taking a bonus action before your attack to activate the stone, your next attack with this gauntlet this turn deals an additional 1d6 force damage.