Mephiston, Lord of Death
Mephiston is the Chief Librarian of the Blood Angels. Then known as Brother Calistarius, he was buried under rubble on Armageddon for seven days and seven nights. During this time the Black Rage came upon him and he fought to suppress it. Calistarius' will stayed strong, however, and he emerged from the rubble as Mephiston, one of the most powerful psykers ever to bless the Emperor's name. Under Lord Commander Cervan Dante he quickly became the Chief Librarian of the Blood Angels, and Dante's right hand man. He is one of only three known survivors of the Black Rage, having defeated its hold upon himself twice.
Lord of Death
Shortly after defeating the Rage, Mephiston's strength -- psychic, physical and martial -- surpassed those of almost all his Battle-Brothers, and he quickly rose to become the Chief Librarian of the Blood Angels, and was granted the title "Lord of Death." His psychic powers are so great that few can surpass him, and no other member of the Astartes could best him. His skill in combat is comparable to the greatest of heroes that the Imperium of Man has ever known. Some say that a part of the true power of his Primarch runs through him since his defeat of the Rage, and he is indeed a son of Sanguinius.
The Reborn Angel
After Gallio and Vode were both killed by Arkio's loyalists, Mephiston decided that he, not Dante, should go and deal with Arkio. He reasoned that since Mephiston was a psyker, he could detect the taint. Touching down on the Blood Angels shrine-world, Sabien, Mephiston found Arkio and searched him for taint, which he found. He was about to challenge Arkio to a duel when Rafen called out and said that he would fight him. Mephiston looked into Rafen's mind and saw that Rafen had seen a vision of Sanguinius and that he was destined to fight Arkio. After Rafen wounded Arkio and Arkio fled, the corrupted Inquisitor Stele ordered the Loyalist Blood Angels and the warriors of the Reborn to attack Mephiston and his entourage. By the time Rafen had defeated the princeling daemon Malfallax, Mephiston's iron will had snapped, and he fell into the Black Rage. Rafen directed the power of the Spear of Telesto at Mephiston himself, breaking the curse.
Sources
- Codex: Blood Angels (4th Edition)
- Codex: Blood Angels (5th Edition)