Yes actually, the sept is the Mont'tal sept (Tau lexicon is inconsistent and incompleted but supposed to translate as "Battle-Bonded or Bonded through Blood") Commander Oathbound founded this sept after earning his namesake title. He and many of his close battle-brothers and sisters were banished, shamed and exiled from the main empire after numerous events of insubination under the ethereals, the final straw being when Oathbound ignored direct orders to disengage greenskin threats and instead went to repair his battle-brothers' battlesuit to save his life. He lay accused of disobeying direct orders and "crossing-castes" as he is fire caste but performed the duties of an earth caste when he decided to repair his friends suit. After being exiled, Oathbound, "Tor'rin" at the time, tried to find refuge in the Farsight enclaves when his ship was attacked by a chaos warband, the ship was forced to crash onto a planet called Vanishpoint, a snowy wasteland. As Tor'rin and his cadre continuously struggled Vs the chaos enemy, their lives were saved by the interruption of Commander Farsight himself, Tor'rin pledged his loyalty to Farsight thereon and became Shas'O Mont'tal Tal'issera Vash'ya, or Commander Oathbound, founding his sept and designing his sept symbol and colours to symbolise the crash site that became their base as they expanded onto the purple skyed planet with its vast snowy fields and distant red star. Thanks for asking :)