Engetsu

 You call upon the dark powers of your blade unleashing them upon thine enemies, a black circle forms around your targets illuminated with red and black runes using all your might and bloodthirst you call upon the dark powers that live inside your sword to conjure black flames that devour your enemy, this spell is a mixture of black flames, souls of the dead, cold winds of death, the pulling force of the depths, and finally the sweet release of death from the deepest parts of hell inviting the creatures that are hit by it to join the hundreds that you have killed.

The creatures affected by this spell take:

-10d10 fire damage;

-10d10 necrotic damage;

-10d10 cold damage;

-10d10 force damage;

-10d10 psychic damage

After Effect:

After you use this spell you feel the exhaustion take over you and fall unconscious to the ground, being out of the battle for 10 rounds, you wake up after 10 rounds or if one of your party members wakes you up expending an action to rise you. You cannot use this spell again until the next week if you aren't using a weapon has a beacon of power, if you are you can only use it again when the sword has it's full charges restored.