This is a secret technique to increase the speed of a Spirit Vessel by sacrificing personal Essence Blood. It causes significant damage to oneself, but at this moment, the woman in the black robe no longer cared about the consequences.
The speed of the Spirit Vessel did increase, but not as much as the woman in the black robe had anticipated. The speed of the Crane Bronze Statue was still increasing, and in just a few breaths of time, it considerably closed the distance with the Spirit Vessel again.
"Deng, it's your turn."