Under normal circumstances, when the Tianyan Immortal Domain faces a major crisis, the various forces would not easily start a war, as war would deplete their own strength. Even if the war is won in the end, they might be unable to cope with the next crisis due to the damage to their foundations.
But after knowing that Lu Chen possessed a Holy Tier Array capable of sealing bizarre creatures, the intentions of the Star River Immortal Venerate and the others changed somewhat.
Lu Chen being able to acquire a Holy Tier Array means he might have indeed encountered the tomb or relics of an Immortal Emperor in the Chaotic Sea, which could mean he obtained opportunities to become an Emperor.
Moreover, even if Lu Chen didn't gain opportunities to become an Emperor, he has something that can deal with bizarre creatures. This alone gives them a reason to put pressure on the Mysterious Moon Palace.
