Predator Vs Scavengers.

They heard of the demon with the spatial artifact. Some didn't believe it but these 14 did. They came here waiting for Aeternus to offer him a deal. They need resources and access to abyss altars. They hoped that can get it from Aeternus in exchange for their collective strength and protection. 

Maybe that wasn't their plan before. There's no way 14 demons skulking about can be up to any good. But they changed their minds when they saw his fight with Alkazhi. Aeternus undoubtedly had the strength of a high-rank demon and he was stronger than them individually. So they chose not to fight him and to offer him safety in numbers.

Aeternus nodded his head. "Sounds reasonable. But like I said earlier. Growth needs Adversity."