Six Cylinder Sunset
The worst thing that came out of the Fall by far was the Demons. Almost no one has seen them and lived to tell the tale, but when the Fall tore holes through to the worlds beyond, the beings from Inferno took up residence in Washington, D.C.. Enormous flaming pentagrams made themselves visible in the streets, and what beings wanted to come through, now could.
As I said, there is little written about these guys as almost anyone who has made it to DC never makes it out. But what reports we have confirm one thing without a doubt: when a Demon enters our world, they bring with them an enormous amount of supernatural power – in fact, they are widely believed to be the most powerful beings on the planet now. However, they have to play by our rules, namely Physics and Biology. They are tough as hell (heh, heh) to kill, but it can be done. You can hurt them through enough physical trauma.
That’s a warning, not a challenge by the way.