Periapt of Wound Closure

Wondrous item, major, uncommon (requires attunement)

• Weight: 1.0 lbs.

While you wear this pendant, you stabilize whenever you are dying at the start of your turn. In addition, whenever you roll a Hit Die to regain hit points, double the number of hit points it restores.

Source: Dungeon Master’s Guide p. 184. Available in the SRD