Among the thousands of worlds held by The Covenant lies the outer colony of Mwynn, a vibrant paradise where some of Sangheilios ancient sailors of the stars settled during the forming of The Covenant. Long ago a war broke out after touchdown on the world that saw many faithful Sangheili of Urs see visions of deities they named their colony for. The War of the Visions was resolved when two rival warriors of the Fayum and Calum Keeps of eld banded together and stopped the bloodshed.

Their monument to their deeds laying high in the Zi'Tah Mountains, named for Zi 'Calum and Tah 'Fayum, and the combined efforts between the twin Keeps of the Fayum and Calum.