Mephiston
From Lexicanum
Mephiston was originally known as Brother Calistarius. In this incarnation he was a Blood Angels Librarian of some ability and exceptional strength of character. Nonetheless, when fighting as part of the relief force for Hades Hive during the Second War for Armageddon campaign, he became a victim of the Red Thirst. Inducted into the Death Company he took part in the assault on an Ecclesiarchy building, and was one of many trapped inside when the building collapsed during the battle.
For seven days and seven nights Calistarius lay trapped in the rubble, teetering on the edge of death and madness. But somehow, rather than succumbing to the Red Thirst, he managed to conquer it. By sheer strength of will he was able to suppress and hold in check the feelings of rage and the desire for blood, and in doing so he became something more than he had been before. For the seven days and nights he dug his way out of the ruined Ecclesiarchy building. Then on the seventh night he burst free of his rocky tomb, reborn as Chief Librarian Mephiston, the Lord of Death.
Mephiston is undoubtedly one of the most powerful active psykers in the Imperium, possibly second only to Chief Librarian Tigurius of the Ultramarines, though both are surpassed by the pure psychic force that is the Emperor of Mankind.
Wargear
Mephiston is armed with a Force sword, Plasma pistol and wears Artificer armor, incorporating his ornate Psychic hood. Overcoming the Red Thirst enabled Mephiston to release his full psychic potential and he is able to call on any number of psychic powers related to the Blood Angels.
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