Reclusiam

From Lexicanum

The Reclusiam is a chamber located within the fortress-monastery of a Space Marines Chapter (or the flagship in the case of a fleet-based chapter). This is the place where the chapter's holy relics are displayed, and where the Chapter's cult ceremonies and rituals are performed in the presence of the entire Chapter. These are carried out under the guidance of a Chaplain with the title of Reclusiarch, and his superior, the Master of Sanctity, who is the spiritual head of the entire Chapter.

Sources

• Warhammer 40,000: Compendium, Chaplains and Commissars