Morpal Cxir was a commander of the Word Bearers during the Great Crusade and Horus Heresy. Serving under Kor Phaeron, Cxir was one of the major Word Bearers officers in the Battle of Calth. However after leading a failed attempt to annihilate a group of Ultramarines survivors under Remus Ventanus, Cxir was captured. The Word Bearers commander urged Ventanus to surrender now, assuring them he would vouch on their behalf. When that failed, he goaded Teus Sullus into killing him by mocking Roboute Guilliman. Cxir died laughing, and in death was used as a vessel for Samus to enter the Materium.