This vessel had to be anything but ordinary, for it would serve as the vessel for a King's Artifact.
Zhao Fu carefully searched through the Calamity King's Ring, looking for something suitable to use as a vessel. A sword would be best, and the highest-quality swords in Zhao Fu's possession were the Massacre Sword and the Imperial Killing Sword.
The Massacre Sword was an earthly divine artifact, possessing abilities comparable to a divine artifact and tremendously powerful. It contained the Massacre Sword Spirit, which Zhao Fu did not wish to erase, because when a King's Artifact was fused, the artifact spirit within the vessel would also be wiped out.
Moreover, the Massacre Sword's nature was one of frenzied, twisted, cruel, perverse slaughter. It seemed both suitable and unsuitable as a vessel for a King's Artifact, so the Massacre Sword could be ruled out.
That left only the Imperial Killing Sword. Its quality was that of a Source Artifact, perhaps even higher than the Massacre Sword's. It had originally been the Zhanlu Sword, a sword of benevolence and virtue, as well as one of the Monarch Swords. Later, Zhao Fu had forged it into the Killing Heart Sword, giving it the power to annihilate souls.
Afterward, it became the core of the Killing Sword World, fusing with endless sword intent and killing intent, possessing the power to destroy Heaven and Earth, and even reforging the Killing Sword World.
However, after the reforged Killing Sword World absorbed Zhao Fu's emperor power, its killing sword power weakened somewhat. Yet because it now possessed emperor power, the Killing Sword World was renamed the Imperial Killing Sword World, and the Zhanlu Sword was renamed the Imperial Killing Sword.
Though the Imperial Killing Sword was now filled with the power of sword intent and killing intent,