Magia Erebra (5e Spell)
From D&D Wiki
|Casting time:||1 Action|
The supreme armament an ancient vampire created when she was still weak to become powerful. The Magia Erebra is a spell which condenses magic in the palm of the users hand, who then consumes the energy to extremely enhance their physical capabilities. With an action you activate the Magia Erebra, gaining the following benefits: your Strength, Dexterity and Constitution scores increase by 2 (this increase can take the score over 20) and you cause an extra 1d6 of either fire, lightning or cold damage with your melee and ranged attacks. Depending on your choice for the type of extra damage you also get, an extra +3 fire damage if you chose fire, 20 more feet of movement if you chose lightning or a +2 to your AC if you chose cold. Depending on the type you chose your form changes slightly, with fire your skin and hair turn a dark red, with lightning your skin and hair turn a bright purplish white and with ice your skin turns pale and your eyes turn an icy blue.
You can keep this form going for more than 1 minute, by sacrificing 10 hit points on the form's last turn. After doing this you gain 1 level of exhaustion for every minute you extended the form.
At Higher Levels. When you cast this spell using a 9th level spell slot you use the complete form of Magia Erebra. You condense magic on both hands, doubling it's power. You gain advantage on every check and save that uses Strength, Dexterity and Constitution (you also still gain the score increase), your damage bonus increase to 2d6, and you bonuses depending on your choice are doubled and gain the following benefits as well: if you chose fire you can score a critical hit on a roll of 19 or 20, if you chose lightning your movement doesn't cause attacks of opportunity and if you chose ice when you are hit by a melee attack the attacker is frozen and loses half of their movement until the end of their next turn. Your appearance also has more changes, your body emits energy, making it look like you are actually made of either fire, lightning or ice.
If you use Magia Erebra 30 times in less then half a year, and at least 10 of those times you used it as a 9th level spell, you are corrupted by the spell and become a creature that resembles the spell's creator. The Constitution increase from the spell becomes permanent (so when you activate it again it doesn't change), you gain a regeneration feature, that heals you at the start of each of your turns for an amount of hit points equal to your Constitution modifier, and your type becomes fiend. Also, when activating Magia Erebra you have physical characteristics that resemble a demon, like horns, claws, maybe even a tail.