Does slaughter need a reason? Perhaps individual combat might, but for the death struggle between ethnic groups, perhaps merely encountering each other is enough...
"Boom!"
Explosions resounded in all directions simultaneously, and when warriors truly stepped onto the battlefield, it was actually quite hard to distinguish directions.
The sound of explosions, battle cries, and screams—combined with bursting and shockwaves—easily plunged the sense of direction of ordinary people into chaos.
"Aaaahhh!"
With the ground shaking, a serpentine giant insect violently burrowed out from beneath the earth.
Its purposeless gaping maw opened wide, and as it emerged, its wide-open jaws brought about a massacre, crunching and splattering limbs and severed arms.
And from the pit it had dug out came a multitude of medium and small battle insects.