Blood Control allows Vlad King to manipulate his own blood and cause it to flow and harden in a way that he seems to be able to control.
The blood appears to be ejected from his gloves, which are connected to tubes attached to various parts of his body. Once the blood is out in open air, Vlad King can harden it to immobilize foes, such as a Dabi clone during the villain raid in the Forest Training Camp Arc. He can also reabsorb his blood back through his gloves if he so wishes.
- Blood - Wikipedia article about the substance Sekijiro can manipulate.