Zhou Heng didn't kill the Lion Monster.
Instead, he locked it up within his Cave Sky.
On one hand, this monster was a rare "Golden Flame Water Lion" from the ancient times, which had long disappeared from the Central Plains and could only be found in the Eastern Sea. It seemed a pity to kill such a rare species directly.
After all, the flesh and blood as well as the fur, scales, and armor of this ancient species were excellent materials for Artifact Refining and medicine making. Keeping it in the Cave Sky for future needs was also a good choice.
On the other hand, this monster was the mount of one of the Eastern Sea's seventy-two Celestials, so it should be privy to quite a few secrets about the overseas lands. Keeping it alive might allow him to extract some information.
After imprisoning the Golden Flame Water Lion, Zhou Heng returned to his home in Huangtong Mansion City.
He continued to comprehend the True Spirit Heart Sutra.