Jack's Ripper Ring (5e Equipment)
From D&D Wiki
Ring, legendary (requires attunement by a Neutral or Evil character)
This Old Golden Ring looks as though it may be worth upwards of 10,000gp.
Curse. Once attuned, you may not take the ring off by any means other than the wish spell.
Drain. You can use your action to say a phrase known only by Jack to make a drain attack against a creature within 5 feet of you. The target must make a DC 15 Constitution saving throw or take 6d4 necrotic damage. You regain hit points equal to the necrotic damage you dealt. You must wait one hour before you can use this feature again.
Bloodied Blade. Any attacks you make upon a creature who is either unaware of or does not expect the wearer to attack, get 1d8 added to the damage roll of the attack.