I dropped the idea of it creating other SCP objects or being in any way connected to other objects. Right now, it basically converts the environment into a single SCP object which takes the form of a freakish alien universe. It's basically the Color Out of Space, except it turns the environment into a survival/psychological horror game. (Which one? All of them.)
It's not necessarily going to kill us, but you probably wouldn't want to become "adapted." And the contamination can be stopped very easy in theory: by continually moving the thing around, since it "resets" if moved too far outside of the current area of effect. Which is pretty much the opposite of how most SCP objects are usually treated, rather than "locking it in a box and forgetting about it," this object needs to be continually moved around or it will begin to warp the surrounding environment. In practice, the problem is that its transport is considered a stationary environment relative to it, and no, spinning it in place does not stop it nor does moving it within the transport.
I say psychological because the landscape is not static (doors may vanish or new ones appear, hallways may lengthen or shorten or branch, buildings rearrange themselves or new buildings pop up, rooms overlap one another, distances behave strangely, etc) and may in fact be psychoactive. Something I'm considering is that it can literally bring a person's fears and fantasies to life, often (and unpleasantly) at the same time. (One of the "rules" of the alien universe was that there was no difference between thought and action: thinking about something was the same as doing it.)