The Ministry of Tranquility is known for keeping an extensive library of Forerunner glyphs. The Minister San 'Shyuum employ Huragok for use as librarians. They also pay Kig-Yar Ship Masters commissions for their work.[1] Their main function seems to be the acquisition and deciphering of Forerunner artifacts.
The Ministry of Tranquility commissions a large and sizable fleet of missionary ships, such as the Minor Transgression, to search the outer edges of Covenant territory for Forerunner relics. It is the only Ministry that employs Unggoy; Unggoy Deacons are assigned to appropriate Kig-Yar missionary ships to ensure that the piratical creatures obey Ministry laws and regulations, a task at which they rarely succeed.[2]
Notably, the Prophet of Regret was formerly the Vice Minister of Tranquility before ascending to the position of Hierarch.