C3148 The Holy War of Myriad Realms
The reason why Chaos Divine Lord listened to Long Chen's advice and chose such a method was to make Myriad Realms God Devil convinced by his defeat. The greatest degree of deterrence they could muster caused them to feel utter despair and wholehearted admiration.
Just the power of the invitation wasn't enough to make Long Chen and the others give up.
Furthermore