Boon Of Spell Recall
Source: Player's Handbook
Prerequisite: Level 19+
You gain the following benefits.
Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 30.
Free Casting. Whenever you cast a spell with a level 1-4 spell slot, roll 1d4. If the number you roll is the same as the slot’s level, the slot isn’t expended.