Arilyn
Hero
And in D&D wizards have to track down new spells, roll to learn them and pay money for expensive inks to write them down in their books. In 5e, however, one new spell appears in their book without any of these costs or effort every time they attain a new level. It's just assumed every wizard has managed to find at least one spell (of the player's choice) per level and the costs are handwaved. This seems pretty similar to the BitD inventory. Typical RPG conventions.