Blood Letting

The caster cuts their arm with a dagger dealing 1d4+8 slashing damage to the caster. The target can then choose one creatrue it can see within 60ft of the caster. That creature must make a Constitution saving throw. On a failure the target is cursed and takes 4d10 Necrotic damage. Any time the caster takes damage from an enemy the cursed creature must repeat the constitution saving throw or take 4d10 Necrotic damage. If the cursed creature attacks the caster they will automatically take 4d10 Necrotic damage. The curse lasts for 1 minute, until it is dispelled, the cursed creature is reduced to 0 hit points or until the caster is reduced to 0 hit points. Alternatively the caster can spend an action to cut themselves once more to forcefully inflict the effect on the creature. 

If the creature travels beyond 60ft away from the caster, is on another plane of existance or enters an antimagic field they are unaffected by the magical effect. 

The remove curse spell casted at 7th level or higehr on the creature affected with the curse ends the curse immediately.