Quarantine shield

The quarantine shield was a Dyson sphere, more specifically a variation of the concept known as a Dyson swarm, composed of trillions of vigilants, formed by the Forerunners around the San 'Shyuum quarantine system which included the planet Janjur Qom. The shield extended four hundred million kilometers from the system's star, and required special access codes to pass through. If the population inside the sphere showed signs of unrest, the shield would enter "battle mode", heightening the vigilants' combat readiness.

List of appearances

 * Halo: Cryptum