War of Wills
From Halopedia, the Halo wiki
The San 'Shyuum Civil War was an internal conflict the arose when some of the San Shyuum began to blive that they should enter the Forerunner Dreadnought, a relic which had been crashedc on their homeworld. An affront to the other's religion, who belived that it sholdn't be touched, they began a civil war. The conflict ended with those who entered the ship (Known as Refomers) fleeing away on it, while the others (Known as Stoics) stayed behind.[1].
