When you are brought to the limits of your endurance, you find hidden reserves of power. You gain the following benefits:
Arcane Exertion. You burn your life force for magical power, casting one of your prepared spells without expending a spell slot, and taking 2d6 necrotic damage for every level of the cast spell, bypassing immunity and resistance. You can use this ability once per long rest. If you are concentrating on a spell, you do not need to make a concentration saving throw due to the damage taken from using this ability.
Arcane Endurance. If you drop to zero hitpoints as a result of using Arcane Exertion, you can make a DC15 Constitution saving throw. If you succeed, you regain 1HP and maintain concentration. If you fail, the spell is nevertheless cast before you fall unconscious, though a concentration spell ends immediately.
Arcane Hunger. If you take elemental damage (fire, lightning, cold, radiant), you can add 1d4 of that damage type to your next spell attack. You can use this ability 1+CON modifier times per short rest.
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