+1 to constitution
Digging deep you sacrifice your life force to desperately cast one more spell. Once per long rest you can sacrifice a number of hit points equal to ten times the spell's level. You can only use it to cast a spell of a level that you have no more spell slots available. If you can cast the spell at a higher level with a remaining spell slot this also does not work. You must also have exhausted any other means of casting such as using sorcery points to create spell slots or a feat that lets you recover a spell slot.
If using this drops you to 0 hit points and you recover you suffer 2 levels of exhaustion. Only rest can allow you to recover. One level of exhaustion is removed for each long rest. If you try to cast spells before fully recovering you suffer an additional level of exhaustion after casting any spell that requires a spell slot (cantrips do not cause this effect).
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