In the Runiverse
Halcyon Sanctum is located in the eastern part of the known Runiverse. The Sanctum lies on the eastern coast of the known continent, northwards from Obsidian City and nearly directly east from Yellow Wizard Haven in the west.
Forgotten Runiverse Game
Halcyon Sanctum is located at (x, y) in the game. To get there, head due east from the origin.