Improve your preparation rank by 1 in a tradition. You can prepare spells and craft scrolls from those traditions with spell tier no greater than your rank.
In order to cast a prepared spell, you must be holding either your spell book or a weapon with the casting trait.
Choose a spell whose tier is no greater than your level. You may cast that spell at will (you still pay its costs).
Every hour, you gain 1 mana.
You may cast prepared spells without your spellcasting focus in hand.