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Operation overview


Shield world

Date of construction:

Prior to the Great Purification[1][2]


Cloister is a hidden shield world installation, built by the Forerunners some time prior to the firing of the Halo Array.[1][2]


During the Fall of High Charity in 2552, a flotilla of San'Shyuum refugees were evacuated from the station by a group including the Prelate Dhas Bhasvod, intending to chart a course for the shield world. By retreating to the shield world, the group intended to have a safe shelter from the firing of the Array, though the death of the Prophet of Truth and subsequent Covenant defeat in the Battle of Installation 00 meant the rings were ultimately never fired. By 2559, whether the flotilla had reached Cloister was unknown to both Bhasvod and Keepers of the One Freedom leader Castor.[3] Cadence, of Edinburgh University, was convinced that the San'Shyuum had survived the Fall of High Charity and was able to secure a research grant from Eto 'Saljhoo (a Sangheili xenoarchaeologist in the Banished) to begin a search for the survivors.[4]

Cloister is said to house Forerunner gene-forges within its myriad layers - these forges are the goal of the San'Shyuum search, who hope that they may save the species from extinction.[1]

List of appearances[edit]


  1. ^ a b c Halo Encyclopedia (2022 edition), page 197
  2. ^ a b Halo Encyclopedia (2022 edition), page 249
  3. ^ Halo: Divine Wind, chapter 7
  4. ^ Halo: Outcasts, chapter 3