Cryptum

Cryptums, or Warrior Keeps, were powerful objects created by the Prometheans. A Cryptum was a sealed capsule where a Warrior-Servant would enter self-imposed exile, involving a state of meditative hibernation known as "timeless xankara". During this time, the Forerunner would become unaware of the physical world around him, and could remain in a state of suspended animation for thousands of years. Cryptums required an extraordinary amount of force to breach once sealed.

The nature of a Cryptum was unknown to most Forerunners, including Bornstellar Makes Eternal Lasting. However, he was aware that the violation of a Cryptum invoked dire consequences, one of which was angering the powerful Prometheans.

A Cryptum was discovered in Djamonkin Crater by the young Forerunner Bornstellar Makes Eternal Lasting, containing the meditating Didact. The Wisdom of Harbou and Strength of Lang were two forces that held the millennial seal on Didact's Cryptum. They denied entry to every species except the Forerunners.

List of appearances

 * Halo: Cryptum