Boon of Spell Recall

Boon of Spell Recall
Feat
Prerequisite: Level 19; Spellcasting

You gain the following benefits.
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.

Source: Player's Handbook (2024) (XPHB), page 211