Ring, unknown rarity (requires attunement by a 6 hours)
Band of Berronar.
Berronar Truesilver the dwarf mother of safety. Wear this bands upon your wrists and once per day ( with the first light of the sun) this band will charge allowing for when your hit points drop to zero or below you automatically stop at zero then get to roll one d8 of heath back to yourself.
Only works once a day. Only works for levels 15 and below.
If you were stopped mid turn this counts as a reaction and you can then make your attack.
Notes: 6 hours