Halo Installation 05

Halo Installation 05, also known as Delta Halo, is a Halo fortress-world located in the Coelest system. Delta Halo is one of two Halo rings to be discovered by Humanity and the Covenant.

Diluvial War
Installation 02 was constructed in the Foundry of the Ark at some point prior to 97,445 BCE, during the Diluvial War. It was transported through slipspace following completion to its present location, and it and the rest of the Halo Array were activated by the Didact, killing all sapient life throughout the Milky Way Galaxy. Following this, Epsilon Halo was used as a regional staging ground for the Reseeding of the galaxy. Once this was completed, the Forerunners transferred all control for its core functions related to the firing of its main weapon to Reclaimers, and departed the galaxy.