[[Spellcasting]] is taxing, so a spellcaster can cast only a limited number of level 1+ spells before resting. [[Spell Slot|Spell Slots]] are the main way a spellcaster’s magical potential is represented. Each spellcasting class gives its members a limited number of [[Spell Slot|Spell Slots]] of certain spell levels. For example, a level 3 [[Wizard]] has four level 1 [[Spell Slot|Spell Slots]] and two level 2 [[Spell Slot|Slots]]. When you cast a [[Spell]], you expend a slot of that spell’s level or higher, effectively “filling” a slot with the spell. Imagine a spell slot is a groove of a certain size—small for a level 1 slot and larger for a higher-level spell. A level 1 spell fits into a slot of any size, but a level 2 spell fits only into a slot that’s at least level 2. So when a level 3 Wizard casts [[Magic Missile]], a level 1 spell, that [[Wizard]] spends one of four level 1 slots and has three remaining. Finishing a [[Long Rest]] restores any expended [[Spell Slot|Spell Slots]].