Battle Of Wills
With a loud boom, the night was blasted away as the several meters wide circular rune lit up in all its glory, saturating the world with pure evil mana, mana so thick that it violently floated about in wisps of smoke, hugging itself around everything that contained life and drilling itself into them through either their eyes, nose, ears, mouth or the spores on their skin.
Of course, with everyone on the battlefield being a soldier, their division an above average one, they were all beings at either the first, second or third order.
Immediately this evil mana poured out, everyone had been on guard, the underworld soldiers who thrived on evil mana included as this sudden event hadn't been in the script.