Memorize spell

Memorize spells: Using a spell slot to store quick knowledge of a spell for use. Spells cannot be used unless they are in a spell slot. While a character may know many spells, they are limited to using only as many spells of that teir of magic as they have available spell slots.

Memorization (slotting) of spells can only be done after using a rest shrine or in a tavern. Certain classes may have additional restrictions.