The hardest part of that investigation was explaining to the demons God of Rogues met what chaos beasts even were. To his frustration, he found that, despite the razor-sharp instincts the demons that lasted any prolonged period there developed, most of them very were deaf when it came to picking up on chaotic auras.
For many of them, the beasts were just ugly. But yes, the beasts. After asking so much, that at some point God of Rogues (to his annoyance, because he tried to be not too open about his search) found demons eager to greet him and answer his questions even before he introduced himself with violence.
Beasts, yes—there turned out to be more than one. There were several descriptions, and none of the beasts was like other. Each was completely unique, and while witnesses could be off in some aspects, no one could mix up creatures that different.