C517 Eerie underground river

As for the halberd behind him, it seemed to have sensed his departure. The halberd abruptly let out a booming sound, it actually caused the surrounding silt to tremble, and rushed into the water, directly piercing into the crevice. The crevice, which only allowed one arm to enter, expanded enough for one person to pass through, causing the halberd to fall in as well