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I think this shows promise, but as others have already said, it seems a bit short for true usability. I like the demonic shadow, and would love to see more detail for it as well (after all, it's inevitable that it be encountered when visiting realm).
I like the overall feel of this. It reminds me of some of my favorite submissions: The Lost City of Akelor, The Field of 10000 Skulls, The Mountain of Boats, etc. It's got a good solid history to it, and contains enough content to be a recurring location. You can use it for any number of plots, and it provides those plots with a minimum of effort thanks to the details and history.
Very nicely done.