Lightning Left (5e Equipment)
From D&D Wiki
Armor (gauntlet), legendary (requires attunement with thundering right)
On first look this gauntlet looks like a plate-gray, worn-down gauntlet that couldn't provide any protection what so ever, but when bought together with it's brother thundering right it turns from plain gray metal to black steel gantlet, with sharp yellow spikes on each knuckle with red lightning bolt like design coming from the wrist going down to the elbow. Your unarmed strikes now deal 1d10 bludgeoning damage plus an additional 1d8 lightning damage, and while worn this gauntlet adds +1 to you AC.
Shocking Blow When you land an unarmed strike with this gauntlet, the target must make a Constitution saving throw at the end of your turn with a DC equal to your 8 + your Strength modifier + proficiency bonus or they become incapacitated until the start of your next turn.
Bounded Pair If you are not wearing the gauntlet thundering right along with this gauntlet it gains none of the feature listed above and weighs 20 pounds, but while you are wearing lightning left it will try and guide you to it's brother tugging and pointing in the right direction. Once you have gained both gauntlets, you can attune to both and gain proficiency in unarmed strikes and heavy armor while you are wearing the pair of gauntlets.