Shadow-of-Sundered-Star,[2] more commonly known as the Ur-Didact (Ur- meaning original), was a Forerunner Promethean who held an extremely high status in the Forerunner society as supreme commander of the entire Forerunner military.[3] He wholeheartedly believed in the Mantle of Responsibility the Forerunners held to protect life, and initially opposed the Halo Array as a sin beyond measure. He was also the lover and husband of The Librarian.

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