Catacombs - Room 17

Where are you? This room defies physical reality as you know it. Everything is emblazoned in shades of violet. You're underground, but somehow a galaxy of stars expands into the ceiling. Flanked by levitating monks, a mystical altar with purple flames contains a large disembodied face of a pagan deity. Its purple eyes flash as it addresses you:

This is the sanctuary of Vaelelil. Seek out other sanctuaries of the Great Ones along your journey. I have a request, mortal. The dungeons ahead plumb depths unknown. Beyond the skeleton city, rumors abound of a castle with passages to mystical realms and intricate subterranean lairs. Allow me to follow your progress by casting a scrying spell. Now go.