After annexing that force, the remaining monsters started to sanction the Corpse Demon quickly. Regrettably, only when they confronted the Corpse Demon did the monsters realize that even a Pope wasn't invincible. Especially after several Popes were slain by the Corpse Demon, the prevailing common sense among monsters was completely overturned.
In the end, despite the combined efforts of many monsters, the expansion of the Corpse Demon was stopped. However, due to these monster groups continuously battling the Corpse Demon, the once peaceful continent eventually fell into chaos.
The reason Blood Moon Lord was so courteous to Zhou Tian was not only to clarify his position but also to express goodwill in maintaining their relationship. After all, the continent was in a state of chaos, with countless monster groups battling each other. If they didn't unite, the Blood Moon Lord could not guarantee his power wouldn't be annexed by other monsters during the turbulent time ahead.