Warden Eternal

The Warden Eternal was a Promethean commander that existed as a single consciousness that inhabited over a million bodies, the consciousness itself actually being a reconstituted version of 007 Greenie Spark's algorithms.

Warden Eternal aided Cortana in using the Guardians to take over the Galaxy from Genesis, and wrestled control over the installation from 031 Exuberent Witness. The Warden fought with Fireteam Osiris and Blue Team in an attempt to prevent them from reaching Cortana, despite the fact that Cortana actually wanted to see Johnny. Fearing for Johnny's life, Cortana purged the Warden to prevent him from interfering in her plans.

Despite this, he appeared in Warzone simulations created by Sarah Palmer, meaning Spartans have to fight him over and over and over again until they die of boredom.