Entering the stone door, the group could see a narrow staircase leading deep into the ground. In the pitch-black darkness, everyone felt enveloped by a profound sense of gloom as they moved forward. The undead knights had emerged from this stone door, but there was not a single one behind it now. On another note, the dark energy here was even more intense than outside. It suggested there was an unknown presence lying deep underground behind this stone door, and it might be the source of everything that was happening.

With this thought in mind, Adrian hastened his pace. He walked steadily downward, and the further they descended, the stronger the surrounding dark energy became.

"Adrian, what was that just now? Were those your helpers?" Safiya asked.

Adrian glanced at her but did not answer immediately. Just when Safiya was about to press further, a rumbling sound echoed from the depths of the underground. The sound immediately caught everyone's attention, and Safiya held back her