Explosive booms reverberated throughout the battlefield outside Yue Tong City.
The undead beings just so happened to be where the battle was most intense, so they immediately became the front line forces for the Heaven Crushing United Army. They didn't even have to run; all they had to do was attack the enemies around them.
These were extremely terrifying enemies to face for the Heavenly Human Tribe United Army. What did it entail to battle an undead army? It entailed fighting someone who was already dead by giving one's life in the process. Essentially, they were sacrificing themselves to kill enemies who weren't even alive.
And that wasn't even the end. Those who fell in the process of battling the undead army would rise again, and they would join forces with those they had been slain by, thereby creating a perpetual loop.
If things continued like this, just the undead army alone would be enough to destroy the Heavenly Human Tribe United Army.