Secret master.

You learn a powerful arcane secret which gives you arcane magic.

Ability Score Improvement : You can increase one of your abilities scores for 1, to a maximum of 20.

Minus occultist knowlegde : You learn1 cantrip from the Warlock spell list.

Occultist mastery : You learn a level 1 and a level 2 spell from the Warlock spell list and can cast them without a spell slot once per long rest. You can also cast them with any aproriatte spell slots you have.

You can use Charisma, Intelligence or Wisdom as your spellcasting ability and an Arcane focus as your spellcasting focus for those spells.