Bloodbind

You target one creature within range that has blood flowing in their veins or is fully covered in blood. The target must make a Constitution saving throw. On a failed save, the target becomes restrained as you manipulate their blood to bind them. While restrained, the creature can attempt to break free by making a Constitution saving throw at the end of each of its turns. On a successful save, the effect ends early. Once the spell is broken—either by the target successfully breaking free or when you choose to end the spell—any blood that was used to restrain the target that covered their body is immediately cleaned off, dissipating into the air or returning to its original state.

You must use an action on each of your turns to maintain the restraint.

Unconsciousness Effect: If the target’s blood flow is restrained for a number of rounds equal to 4 + their Constitution modifier, the target falls unconscious as the strain of the blood manipulation overwhelms them.

Cantrip Upgrade: At level 5 the range increases to 60ft, at level 11 you can maintain the binding using a bonus action, at level 17 the spell may target 2 separate creatures