You can lessen the effects of spells that target you. As a reaction to being hit by a ranged spell attack, you can reduce the incoming damage by a number of d6 equal to your proficiency bonus down to a minimum of 0. Alternatively, as a reaction to being targeted by a spell that requires you to make a saving throw, you can give yourself advantage on that saving throw.
You store the spell's energy inside you and can cast it as a bonus action, provided that you have an available spell slot of equal or higher level to the spell slot used to cast the spell. When cast using this feature and a higher-level spell slot, the spell's effects are not augmented. You may use this feature a number of times equal to your proficiency bonus per long rest.
Holding more than one spell can be harmful to your body. Whenever you store a spell with one or more already stored, you must make a Constitution saving throw, taking 3d8 necrotic damage for each spell already stored on a failure.
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