Although the 4th battle area trained native cultivators, they were not the main force. They only existed as auxiliary personnel.
The facts had proven that these native cultivators who had been cultivated quickly were not reliable at all, and many of them were just there to make up the numbers.
Without the baptism of blood and fire, the temperament of the native cultivators was not qualified at all, but they could do so when they were fighting a war.
If they were defeated on the battlefield, these native cultivators would be the first to collapse, which would then affect the entire battle.
The monster army did not have these disadvantages. After they were brainwashed, they would become real war machines.
On the battlefield, they would advance bravely until they died in battle. They would never run away because of fear.