Thyr 'Valum is a sangheili commander that served in both the Covenant Empire and the Covenant Separatists. Thyr would later side with the various anti-government movements, as well as leading his own group The Crimson Lance, after he was falsely charged with treason. Thyr initially worked with The Fallen but abandoned them after they kidnapped sangheili newborns to frame the humans. The Lance would latter use the Sanghelious Massacre to launch an assault on the Vadam keep. There, during a duel with Thel Vadam, Thyr was forced to question his motivations. Thrown into an identity crisis Thyr exiled himself and the rest of the Lance to the far reaches of space, hoping to find where is alliegences lie.