Charm of the Donjon

D&D 2014 boon: Charm of the Donjon. Source: The Book of Many Things. boon type Charm You can cast Otiluke's Resilient Sphere, requiring no spell components and using your Intelligence, Wisdom, or Charisma as the spellcasting ability (your choice). Once used three times, the charm vanishes from you.

Source: The Book of Many Things, p. 62 - Licenses and attribution