Sometimes a spellcaster may be out of the spell slots needed to cast a certain spell. A spellcaster has the option to use his own life force to power their spells instead of spell slots.
When a caster attempts to cast a spell without expending a spell slot, they must make a Constitution saving throw. The DC equals 10 + the spell's level. On a failure, the caster suffers a number of levels of exhaustion equal to the spell's level. On a success, the caster suffers half as many levels of exhaustion. (minimum 1)
Credit: u/Xyrlian (reddit)
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