Your magical potential increases and you unlock more spells for yourself.
Prerequisite(s): Intelligence, Wisdom, or Charisma 4+, Spellcasting
Benefit(s): Characters who don't receive spellcasting through their class or only receive up to 8 EXP spells can now receive spells beyond 8 EXP. This unlocks the limit for every spellcasting feat you own, not just a single one chosen.