"On both sides, there are monsters."
Perhaps, the words of the audience are closest to reality.
In the domain of the God of Martial Fight, powers outside of the Fighting Path and Talent Abilities had been compressed to the extreme. Theoretically, the only things that could truly be effective were the "flesh" of the contestants and their "fighting skills".
"...It has completely nothing to do with humans anymore."
If both sides were non-human, if from the start their "bodies" were "ethnic groups" or even "worlds" rather than individuals, then the fight that should have been fist-to-flesh naturally evolved in a more bizarre form.
"Boom!"
The achievements of the Legion caused a chain of explosions, and the military force of one had taken shape.
A multitude of Crystal Soldiers appeared on the battlefield, following the War Beast as they advanced, demonstrating the might of a legion through the strength of one.