Ever since he had acquired the Stellar Threads, using many Spirit Formations had become far more convenient. The Invisibility Spirit Formation that once could only be inscribed onto clothing could now be deployed by Huo Hai at any time, making it exceptionally handy.
However, when Little Butterfly was around, she could use it more conveniently and with greater power, so Huo Hai had never needed to turn invisible himself. Now that Little Butterfly was undergoing metamorphosis, he had no choice but to do it himself. Strictly speaking, this invisibility was still far from perfect. Since the Stellar Threads formed a Spirit Formation, it was ultimately still a Spirit Formation.
And any Spirit Formation would cause fluctuations in spiritual power, no matter how faint. Those faint fluctuations could often expose him instead. Fortunately, Huo Hai's Stellar Threads had already spread throughout every one of his Spirit Veins.
Now, using the Stellar Threads was not only effortless, but also far more concealed. Combined with Huo Hai's Qi-Sealing Art to hide his aura, even Spirit Emperor Realm experts would find it difficult to detect his presence unless they paid special attention.
Following the passage downward, Huo Hai moved all the way with utmost caution, afraid of triggering some mechanism or trap. Yet what puzzled him was that he had not encountered a single trap along the way. Could it be that, once inside, the Hidden Assassins believed such things were unnecessary and had simply neglected them? He could not be bothered to dwell on it. Since he had already come this far, there was no reason to retreat.
With that thought, Huo Hai became even more cautious. Yet along the way, the Hidden Assassins truly seemed unafraid of outside enemies—there was not a single trap. At first, Huo Hai had worried that he