The Wizard table shows how many spell slots you have to cast your spells of 1st level and higher. To cast one of these spells, you must expend a slot of the. Thus, each spellcasting class's description (except that of the warlock) includes a table showing how many spell slots of each spell Spellcasting · What Is a Spell? · Casting a Spell. A spell slot represents a character's potential for casting spells each day. Each spell slot is.