The others also suggested. Now was a good time to chase after the underworld. Once they missed it, the underworld would recover and gather its Army again. Once the formation was set up, it would be difficult to break through again.
First, the Queen Mother would need a long time to recuperate after this battle. It would be difficult for her to attack again.
Secondly, the fake celestial weapon of the Empyrean race was not easy to make. Not to mention the difficulty of making it, the materials were extremely precious and rare.
The materials that could be used to forge Immortal Weapons were too rare.
Therefore, over the years, the Empyrean race had only accumulated a few thousand pseudo-Immortal Weapons. They had already used them all in the previous battle.
In other words, all of the fake celestial soldiers of the cangtian tribe were concentrated in the right Army. The other two armies did not have any.