Charm of the Adamant

D&D 2014 boon: Charm of the Adamant. Source: Baldur's Gate: Descent Into Avernus. boon type Charm This charm has 9 charges. You can use an action to expend 1 charge from the charm to gain 30 temporary hit points. For the next hour, your eyes become voids of utter darkness, and you can't be charmed or frightened. Once all its charges have been expended, the charm vanishes from you.

Source: Baldur's Gate: Descent Into Avernus, p. 215 - Licenses and attribution