The once clearly visible nine-story tower now flickered in and out of sight, blending into its surroundings.
Even Foundation Establishment cultivators would find it difficult to notice anything unusual unless they examined it closely.
After setting up the formation, Qing Chen did not immediately let his guard down.
He carefully checked every node of the formation once more, ensuring nothing could go wrong.
Once all this was done, Qing Chen resolved to try every possible means to break through the stone door.
First, he commanded the Grudge Ghosts within the White Bone Demon Banner, sending them lunging at the stone door.
However, the instant the Grudge Ghosts struck the stone door, they were bounced back without suffering the slightest damage.
Qing Chen was not discouraged. Next, he summoned the White Bone Demon Soldiers.
Under Qing Chen's command, they launched ferocious attacks like a pack of hungry wolves against the other walls of the "nine-story tower," and even underground.
Clangs rang out incessantly, yet the "nine-story tower" remained as steady as Mount Tai, without so much as a scratch.
"Hmph, it seems these ordinary methods aren't enough."
Qing Chen snorted coldly, formed seals with both hands, and summoned the Silver-Armored Corpse and Gold-Armored Corpse.
The two refined corpses radiated powerful auras as they swung their Mysterious Yin Demon Fists at the stone door.
Boom! Boom!
Thunderous crashes echoed through the surroundings, yet the stone door did not budge, as though these attacks were merely scratching an itch.
Qing Chen frowned and ordered Demon General Pojun forward.
At Foundation Establishment peak, Demon General Pojun held six White Bone Great Blades, his presence menacing.
He leaped high into the air and unleashed Six Blades as One, cleaving viciously at the stone door with a massive blade over a dozen zhang long.
With a