Faced with a great enemy like the Guihai Demonic Blade, the True Palaces had put aside their previous grudges and united as one. They were prepared to strike first and kill him before the Guihai Demonic Blade fully recovered.
If they didn't join forces, they would definitely be defeated by the Returning Sea Demonic Blade one by one. At that time, they would all die.
Unless he escaped into the vast chaos.
However, if they escaped into the vast primal chaos, they would definitely die when the chaos calamity descended.
After a series of discussions, the Nine Great True Halls decided to join forces and use all their strength to attack the Third Heaven and kill the Guihai Demonic Blade.
Only by getting rid of the Returning Sea Demonic Saber could he face the Chaos Tribulation in peace.