Caustic Plasma

You infuse the plasma in your blood with caustic acid in response to a wound being opened on your body, spraying acidic blood from the wound at your assailant. The creature that damaged you must make a Dexterity saving throw. The target takes 2d10 acid damage on a failed save, or half as much damage on a successful one.

Blood Magic. When you cast this spell, you can choose to deal an amount of force damage to yourself equal to half your level (minimum 1), this damage ignores resistances and immunities. When you do this, the range becomes a 15 foot cone, affecting all creatures within it.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d10 for each slot level above 1st.

Spell created by u/Dracovich of Reddit for The Shadowheart Apocrypha