The reason for wanting the Zhou Emperor to send troops was naturally for the Zhou Emperor's head.

If the Zhou Emperor doesn't die, how can Zhang Huanzhen's child ascend to power?

If Zhang Huanzhen's child doesn't ascend, how can the Great Zhou be destroyed?

Gu Liangyuan calculated the time; it was only a day and a half before the immortals descended to the Lower Realm. He immediately ordered the Yao sisters to return to the Ancient Mo Dynasty and proceed according to plan.