This is Castle Skyguard, headquarters of the Knights of Avandra hidden amongst the Whispering Peaks.

This map is a variant for an adventure wherein an evil mind flayer, Thex, has invaded. It has driven the knights and squires that live within mad and violent. As the party traverses the floors, the castle takes on a psychedelic, green appearance, foreshadowing the battle with Thex.

The Knights of Avandra are led by a group of 8, each wearing special armor with a signature color. The top floor of the castle is similar to a courtroom, where they sit in judgment and as counselors to the townspeople that live in valleys near the castle. This is where the party faces the mind flayer.