Yin Gen looked into the Western Quadrant, deep in thought. He pondered for a few minutes before a ruthless light flashed in his eyes.
"Blood Energy," he muttered to himself. His Zombie Art was technically an evil technique. After all, zombies were abominations, creatures whose existence is rejected by Heaven and Earth since they defy the Order of Samsara.
As such, there is one way Yin Gen could use to increase the speed of cultivating his art–absorbing Blood Energy. By absorbing the yang energy from flesh and blood of creatures, he can balance the Yin Qi in the zombie's bodies, thus accelerating the cultivation of the technique and ensuring users can reach the Golden Zombie Stage and revert to a living creature.
Additionally, absorbing souls can also accelerate this technique since they are Yin Nature.