$begingroup$ It refers to the velocity at which classes gain spell slots and new levels of spells throughout their development. Complete casters (just like a Wizard) gain spell slots speediest, while one/3rd casters only attain slots and new spell levels at about a third that amount. 's spellcasting courses can https://brooksomigh.blogs-service.com/43157807/the-2-minute-rule-for-dnd-caster