It turned out that the flash of cold light Xu Yi had unleashed at the final moment was the Immortal Slaying Sword. The sword had been forged by fusing the Heart of Lightning, refined from Purple Firmament Lightning Strike Bamboo during a tribulation, with the Demon Embryo.
Besides possessing qualities far surpassing those of the Purple Firmament Sword, this treasure could also take advantage of the Demon Embryo's miraculous ability to change form. Most of the time, Xu Yi transformed the sword into a ring and wore it on his hand.
Earlier, in that moment of crisis, he had been driven to the end of his rope. He'd been willing to destroy the Purple Firmament Sword Group just to make the White Core Strange Beast commit to its attack. Only at the very last moment had he risked everything, unleashing the Immortal Slaying Sword and turning it into a rope to catch the White Core Strange Beast. Then he'd activated the Four-Colored Seal, manifested a portal, and dragged the beast into Four-Colored Seal Space in one fell swoop.
Xu Yi had been seething with anger, and he'd thought he could finally get his revenge once he entered Four-Colored Seal Space.
Who could have guessed that the White Core Strange Beast would remain just as ferocious inside? Though its waves of light were dispelled by Four-Colored Seal Space, its powerful body and terrifying speed were unaffected.
Its sheer physical strength was enough to drive Xu Yi into a panic. He hastily activated the restrictions and tumbled out of Four-Colored Seal Space with his tail between his legs.
He lay sprawled on the ground, panting for more than ten breaths. Even then, he didn't dare delay. He used the twenty or thirty Purple Firmament Swords he had left to build a makeshift