This power is granted by a devil. Once per turn when you cast a spell, you may cast that spell at a higher level. For every level you raise this spell, pay 1d6 max HP. When you complete a long rest, make a DC 10 Constitution Saving throw. On a pass, you get back all of the HP lost this way. On a fail, you get back half. If this feature takes your max hp below 0, you are dead and cannot be revived except by the Wish spell, or perhaps another deal...
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