Student of the Arcane (5e Feat)
From D&D Wiki
Student of the Arcane
Prerequisites: Spellcasting or Pact Magic Feature, Intelligence of 13 or higher
You have delved not too deeply in a school of the arcane. Increase your Intelligence score by 1, to a maximum of 20. Choose one school of magic. You now have access to spells of that school equal to half the highest level spell slot you have, rounded down.