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.

List of appearances

 * Halo: Cryptum