Previously attracted a young shadow dragon named Yakoron, who made a lair outside of the portal entrance. Yakoron fell into the Shadowfell and clawed his way back out as a shadow dragon, becoming "the Umbral Plague"
There are three pathways to walk. Left goes level, center goes up, right goes down.
At the end of the left-hand passageway was a door with an X inscribed above it. Beyond that was the inscription:
Use the knowledge expressed within this castle to guide you across the correct path. For the only thing we can truly rely on in this world is our ability and want to learn