They were like a ghostly troop, silently sweeping across the battlefield, assassinating every enemy leader or captain whose demise could significantly alter the course of the battle. Even the leaders of the Bloodletting Demons could not escape their assassination attempts unscathed.
Once the leader of a troop was killed, the whole unit would immediately plunge into chaos. Although each warrior of the Catastrophe Legion possessed astonishing strength, such individual strength was almost negligible on such a battlefield if it did not reach the extreme. Without forming an effective formation, they would be easily harvested by other units of their own side.
Moreover, they would not linger over the results of the assassination. Even if the beheading action was unsuccessful, they would immediately retreat and seek the next target, spreading chaos throughout the enemy lines.