Bloods Retribution Strike

You cut your hand wiping your blood on your weapon imbuing it necrotic energy. This causes you to take 1d12 necrotic damage and reduces your hit point maximum in till your next long rest as your blood imbues your weapon with negative energy , but for the duration of the spell your weapon adds 1d8 necrotic damage to your weapon damages rolls.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, add an additional 1d4 per spell level over 3rd level but this also is adds 1d6 to the damage taken to cast the spell this also reduces your hit point maximum.