Anyone tangentially familiar with [Chaos] knows that it is an incredibly powerful type of energy that can render most aether based offenses and defenses absolutely useless. They would also know that it is rendered equally useless when dealing with Dragon Force, aka, the energy of "perfect" [Order].
However, aside from this obvious weakness, there was one other thing that [Chaos] users, more specifically Zhen Liu and his kaijn, was weak to: music.
Logos and Pathos explained that since kaijin, and by extension Zhen Liu, were being empowered by [Desire], human emotion really, that something that had the ability to sway such feelings was either a powerful tonic or a deadly poison.
The weird part was it wasn't all types of music, just music-based aether arts.