Forerunner worlds

Though the Forerunners disappeared over 100,000 years ago, their legacy lives on in the form of their constructions, both places of refuge and weapons of war.




The most infamous is the Halo Array, including Alpha HaloDelta Halo, and the Ark, though there are far more shield worlds scattered throughout the galaxy.  The largest is known as the Sarcophagus, which has a radius the size of Earth's orbit around the sun.  Though as-of-yet undiscovered by humanity, Maethrillian was the capital of the Forerunner government and possibly the most fascinating Forerunner world.