High Ecumene

The High Ecumene was a period of time in the history of the Forerunner Ecumene, likely during its height. At the very least, the period spanned the millennia prior to the outbreak of the Forerunner-Flood war in 97,764 BCE.

Events

 * The Skirr-class battlecruisers and the Second-order fast frigates are put into service during this time.
 * Decades prior to the Flood War, Raptors entered service with Builder Security.