Prerequisite: You have to be able to cast atleast one first level spell
You learned where your limits are, and know exactly how far you can exceed them. While you are out of spellslots, you can exchange 1d10 HP and the same amount of level of exhaustion to cast a spell. (For example: You have no spellslots and want to cast the 3rd level spell summon lesser demons, you can cast it in exchange for 3d10 HP and 3 level of exhaustion. This is possible for spells up to level 5)
(You can also use this as a house rule for all casters)
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