Rival?

Chaos ran rampant wherever Michael looked. The crowded alleys with dozens of prestigious training grounds and Ancient structures from the Origin Expanse were now utterly devastated. Dozens of missile pits, collapsed buildings, and corpses of unfortunate victims could be seen everywhere.

Debris and rubble had been flung in all directions, damaging the few buildings that didn't collapse from the Perses Missiles' explosions. 

"They targeted the Ancient Buildings," Zeke mumbled quietly, "How did they even know the location of all those places? Had they been planning to attack Piloq for a long time? But that…"