Betrayal [2]
The geniuses and even the Demons were so focused on the ongoing fight that they weren't able to notice the changes to the overall environment around them.
The battle had started in the middle of the day, so the sun was still high in the sky, casting plenty of light upon the ground. But at some point, the light of the sun had begun to dim.
A blackness overtook it, causing dusk to descend upon the brightly lit battlefield. Shadows quietly spread through the earth below them, and before long, the entire area was encompassed.
In a mere instant, it became night. For the first time since the chaotic battle began, the Demon Generals lousing around in the back had grim looks on their faces.
"Swamp of Darkness."
A crisp voice flowed through the air like a melody. The small scuffles and major waves taking place on the battlefield came to a half, as if everyone present was mesmerized by the voice.
"Arise."