The Human race gathered in the remote mountains were quite a force to be reckoned. If the Human race could aid the Desolate race, then there might be a slim chance for the Desolate race to resist against the Black-armored Demon God, and turn the tables.
For a group of weaklings to face a mighty force was analogous to a herd of sheep resisting a tiger. Under normal circumstances, no matter how many sheep went forward, they would all end up dead. The differences between the two was an insurmountable gap. It was not something that volume could make up for.
The Human and Desolate races were in a similar situation against the Black-armored Demon God.
In a direct clash between a herd of sheep with a tiger, they were bound to fail!
The only thing that could narrow the gap between the two was to gather the weaklings' powers together, and that was with an array formation!