With an Immortal Lord–level powerhouse personally entering the fray, and the Void Beasts' leader deliberately keeping its distance, the immortal army's rout of the Void Beasts outside the passage caused no stir whatsoever.
The immortal army then spent considerable resources setting up a poison formation near the passage's exit. Poisonous clouds blanketed the area, obscuring the main formation, while vast amounts of toxic gas filled the passage inside and out.
Having learned from their previous experience, the immortal army had realized that ordinary seals were no longer enough to trap the astonishingly numerous Void Beasts.
Even a temporary seal could not hold the beasts for long. Once the immortal army and the Sky-Shadow Clan engaged in battle, the massive blood qi released by the casualties on both sides would still provoke the beasts into a frenzy.
These three poison formations, large and small, shrouded the mouth of the cavern in fierce toxic gas. The formation plates and flags were also hidden within the main formation, so for the Void Beasts to break through, they had to endure several rounds of poisonous baptism and venture deep into the poison formations.
These poison formations were not difficult for some skilled formation masters to break. The Sky-Shadow Clan had always possessed that ability, but their people could not come out.
Even the leader of the Void Beasts would not lightly risk itself, despite its greater strength. For ordinary Void Beasts to break the poison formations was extraordinarily difficult, and the process would take an extremely long time. With formation masters in the immortal army dedicated to this task, that time would be extended considerably.
Chen Fufeng and Prison Lord Bai Tai's main duties were to deal specifically with the Sky-Shadow Clan and rout the beasts outside the passage. After temporarily blocking the passage