Oathkeeper's Resolve

Armor Class: +2
This magical shield's glassy lens glows brightly
when an ally you can see falls unconscious.
Once per day, you may use your reaction to
transfer the shield's holy light to all unconscious
allies within 60 ft. that you can see, granting
them advantage on their next death saving throw.
Any ally who rolls a 19 or 20 on this death saving
throw is immediately restored to consciousness,
regaining 1d4 + 1 hit points.
Requires Minor Attunement by Paladin or Cleric.