Good Memory Spontaneous casters (bards and sorcerers) who have positive Intelligence modifiers have additional spells known at each level per the table Bonus Spells Known. Prepared casters gain bonus cantrips known only, but can prepare additional spells at each spell level based on having a higher Intelligence (and therefore a greater capacity for memorization). Warlocks and rangers are now prepared casters under House Rules; see Access to Omnipotence . The usual rules still apply for learning said spells, as a 5th-level sorcerer who attunes to a headband of intellect +2 which increases his Intelligence score from 14 to 16 (and therefore his modifier from +2 to +3) doesn’t “suddenly” know an additional 2nd-level spell, nor does he automatically know an additional 4th level spell, as he can’t yet cast from that level anyway; it must be a spell you have studied (from a spellbook or scroll) or which has been taught to you by another spellcaster. Typically, you must have studied and practiced the new spell(s) for at least one long rest per spell level before you can add them to your repertoire, so the aforementioned 5th-level sorcerer will need to wait two long rests before the new 2nd-level spell becomes