When you have expended all of your available spell slots, you can push your body beyond its natural limits to continue casting magic. While you have 0 spell slots remaining, you may cast a leveled spell without expending a spell slot. Each time you do so, you gain 1 level of Exhaustion. Exhaustion is cumulative. Each level represents the increasing physical toll of forcing magic through a body that has nothing left to give. You cannot use Spell Exhaustion while you have any spell slots remaining.
1st Level — Strained: Speed is reduced by 10 feet.
2nd Level — Weakened: You can not take reactions.
3rd Level — Failing: You have disadvantage on saving throws and attack rolls.
4th Level — Critical: Your hit point maximum is reduced by half.
5th Level — Death's Door: Your Speed becomes 5 feet, and you cannot regain Hit Points.
6th Level — Final Cast: You draw upon the last spark of magic your body can bear. You may cast one final spell, which resolves normally. When the magic leaves you, so does the last of your life. There is nothing left to give.
The effects of Spell Exhaustion are cumulative. Exhaustion is removed when you complete a Long Rest.
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