Sylvasta's Blood Forge

The target must make a constitution save, and take 9d4 piercing damage if they fail, and half as much if they succeed the constitution save. Also if they fail, the caster may activated one of the secondary effects listed below. Both effects have a speed of 30ft and can be commanded as a bonus action.

Blood Daggers. You extract a floating swarm of blood daggers within range from the target. The swarm of daggers takes up a 5 foot by 5 foot cube where the target is currently located. A creature takes 5d4 slashing damage when it enters the spell’s area for the first time on a turn or starts its turn there.2

Blood Sword. You extract a floating Sword made of blood within range from the target. When you cast the spell, you can make a melee spell attack against a creature within 5 feet of the weapon. On a hit, the target takes slashing damage equal to 1d8 + your spellcasting ability modifier.

At Higher Levels. Damage die for each effect increases by 1 at each level higher than 4th you cast this spell.