Adept Spirit (EFA - A)

Your spell infuses a portion of the spirit of a powerful ancient spellcaster into a willing recipient, increasing their skill with magic. This skill exists as a latent potentiality for 8 hours, the target finishes a long or short rest, or the target creature uses the potentiality as follows:

The target creature can use its reaction to give itself advantage on Intelligence (Arcana) checks and saving throws against spells for 1 minute.

Once this 1 minute expires, the spell ends.