After a long war between the San'shyuum and the Sangheili, the two species finally formed an alliance, creating the Covenant. A group of Sangheili, however, did not agree with this alliance and fled to a hidden Forerunner shield world known as the Refuge to continue their community outside of Covenant influence. Thousands of years later at the end of the Covenant, a San'shyuum and his ship traveled to find the lost colony, and discover it still survived, though it was about to fall apart.
Aside from the Refuge, High Charity and Janjur Qom serve as the settings for Broken Circle.
Broken Circle takes place partially on High Charity, including the Forerunner keyship at its heart, Anodyne Spirit.