The demons were the first extraplanar faction to set upon Zaradene after the Puncture. Still, they sent only a small group compared to the horde that descended on Goodbay hours later. When the city was last seen no humans and few demons were in evidence, and many structures were toppled, sundered, or burned to ash.
Demons are implacable forces of mayhem. Most demons cannot be reasoned with; nor can they be negotiated with, since they have no government or power structure per se. The only rule among demons is that the strong take what they can.