They did it. Betrayed humanity. No stated purpose. The SCP Foundation just announced themselves to the public and the fact that their new goal was to exterminate humanity. Nothing more, nothing less.

The GOC did their best to protect the world from the sudden onslaught of dangerous anomalies, but eventually, all of the survivors were pushed to one final city; the city fortress of Ganzir, located in the Atlantic Ocean. So far, the GOC and civilians brave enough to help defend the city had done an excellent job of keeping the Foundation out. At the very least, it was for now. Who knows what new event could occur and break the siege?

(yes this prompt is very open so that you can choose to be an anomaly, mtf guy, goc fella, civilian or whatever you come up with, but at least state what you are in parenthesis, thanks)