Yusuf Zuck remembered that when he first acquired the Purple Light Sword, it had been at the bottom of the Jade Pacific. At that time, the sword was thrust atop the skull of a giant skeleton with two claws.
Afterward, the sword brought him many unexpected gains. For instance, the aura it emitted could directly subdue demon cultivators, especially those of the dragon kind, such as snakes, Jiaolongs, and dragons. Facing this sword, they couldn't even muster the strength to resist.
Yusuf Zuck had never performed a blood oath to claim ownership, so he never stored the sword in his Dantian. Later, it was taken by the Azure Emperor, and according to what Mr. Petty said, the Azure Emperor hadn't unleashed the sword's full potential either.
Just now, he had subdued that spirit sword with a drop of Soul Dew, so he was convinced that his Soul Dew was indeed of a divine level, something that only he possessed under the vast heavens.