Crimson Enhancement

You coat your weapon in blood, black runes coagulating on its surface.

Deal 1d4 damage to yourself as you coat your weapon in blood, every attack made while the blood coats your weapon deals an additional 1d6 necrotic damage.

At Higher Levels. When you cast this spell using a spell slot of 2 or higher, add an additional 1d4 to the damage to yourself and an additional 1d6 per spell level.