Blood Bend

When you cast this spell, your current hit points are reduced by an amount equal to the spell's level.

You reach out and attempt to seize hold of a Medium-sized creature's blood, controlling it like a puppet. The target must succeed on a Strength saving throw or be restrained for the duration. The target must have blood to be effected.

On the same turn you cast this spell, and using your actions on subsequent turns, you can take total and precise control of the target. Until the beginning of your next turn, the creature is no longer restrained but only takes the actions you choose, and doesn't do anything you don't allow it to do. You cannot force a creature to use it's class features, cast spells, or manipulate spells while controlling it, and the creature remains aware of itself and can speak normally as it acts against it's will. During this time, you can also cause the creature to use a reaction, but this requires you to use your own reaction as well.

At the end of each of it's turns, the target can make another Strength saving throw. On a success, the spell ends on the target.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, you can target one additional Medium-sized creature for each spell slot above 5th, and can control each of them with your action. You can cause multiple creatures to use their reactions by using your own reaction, but only if their reactions use the same trigger. The creatures must be within 30 feet of each other when you target them.

Alternatively, you can control a creature of a larger size, requiring an additional slot level above 5th for each size category above Medium (for example, a Huge creature would require a spell slot of 7th level).