Atlas' Charm of Survival

You concentrate on a piece of gold jewelry for a 10 minute ritual, layering contained Abjuration magic over the item. Once 10 minutes have passed, the item can be worn by a creature without attunement and they will be partially warded from killing blows.

While wearing this active item, if the creature endures an attack (whether physical or magical) that would bring them to or under 0 hit points, the latent Abjuration ward will activate to absorb half of the damage. Once the charm has been activated the spell is complete, and will need to be recast in order to be used this way again. Area of effect attacks will activate the charm, so long as it is an attack with intent to harm.

If cast at higher levels, add 2 days to the duration for each level above 3rd.