The Blood Song Aura actually had some side effects. If one was swayed by violent emotions, it was all too easy to fall into a frenzied slaughter.
Dawn had developed this ability because his will was firm enough to perfectly control it.
If the Blood Song Aura were fully applied to a single person, nine times out of ten, anyone without that level of willpower would fall into a berserk urge to kill.
Fortunately, this was a "super-diluted" version spread across a hundred thousand elite troops. That trace of frenzy was more like fighting spirit being stirred within the Marines.
Moreover, the surge in strength allowed many Marines to kill enemies who had previously been evenly matched with them, greatly boosting their morale. This spread throughout the battlefield, raising Marine morale across the board and slowing the pirates' advance even further.
As for why he did not further bolster the Marines with the Battle Song Aura, it was because Dawn had already completely absorbed that ability and turned it into his own strength. It had essentially become a passive ability, making it impossible to buff anyone else with it.
And even if he could, he would only choose to activate the Blood Song Aura. Setting aside its ability to boost fighting spirit, Dawn simply could not sustain the consumption of having two auras stacked at once.
After all, maintaining an ability that affected and enhanced a hundred thousand people was no easy task. Sooner or later, it would drain him dry, and that time would not be too far off.
Of course, that was assuming Dawn was maintaining both enhancement auras. This was a battlefield, and there was no shortage of pure soul energy released by the dead.
It had been a long time since he had merged Ouroboros into