Periapt of Wound Closure (perēˌapt / wo͞ond / ˈklōZHər)

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.
Found On: Magic Item Table F

Source: DMG, p184 (Major tier magic item) Available in the SRD.
https://5e.tools/items.html#periapt%20of%20wound%20closure_dmg

Item type

Magical

Rarity

Wondrous item, uncommon (requires attunement)

Weight

1 lb.