Stripped of armor and might, the Forerunner warrior known as the Didact was torn free from the physical world following his epic confrontation with the Master Chief, and sent reeling into the mysterious depths of a seemingly endless desert wasteland. This once powerful and terrifying figure is now a shadow of his former self-gaunt, broken, desiccated, and alone. But this wasteland is not as barren as it seems, as a blue light glints from the apex of a thin spire in the far distance...