Well, that's not good.
I heard a lot of noise from not too far away. I didn't know what caused it, but I sure as hell wasn't going to let it sneak up on me, so I grabbed a pointy object and took a look around.
And what else did I find but an Operator Symbol? Painted in a reddish-brown substance my leading theory says is blood, no less?
Craaaap. I need to sleep someplace more defended.