Erebos's Disciple

D&D 2014 boon: Erebos's Disciple. Source: Theros: No Silent Secret. boon type Piety Trait Piety 25+ Erebos trait When a soul is sent to its rightful place, you can draw on the energy of the Underworld to empower you. When a creature dies within 10 feet of you, you can use your reaction to gain a number of temporary hit points equal to your level.

Source: Theros: No Silent Secret, p. 43 - Licenses and attribution