Periapt of Wound Closure
Wondrous Item, uncommon, requires attunement · 2024 rules, SRD 5.2
While wearing this pendant, you gain the followingbenefits. Life Preservation. Whenever you make a Death Saving Throw, you can change a roll of 9 or lower to a 10, turning a failed save into a successful one. Natural Healing Boost. Whenever you roll a Hit Point Die to regain Hit Points, double the number of Hit Points it restores.
Also in the 2014 rules (SRD 5.1).