Cogidubnus was born among the deep-forests of Caratacus, a moon of vast ancient woodlands and mist-choked lakes. According to recovered oral histories of his now extinct birth-tribe, the young Cogidubnus displayed signs of "voices in the wind" long before his selection as an Aspirant. Warnings of unseen predators, communing with ancestors or guiding hunters toward distant prey. Such phenomena are common among Psykers and are often interpreted as ancestral spirits. In truth, these are early stirrings of nascent warp-sense. His abduction into the Chapter, what the tribes interpret as divine ascension, was reportedly uncontested. The tribe seers declared him "claimed by the Deepness," and no blade was raised in protest.
Upon induction, Cogidubnus was taken to Deepfathom Cairn, the Celestial Questors' abyssal Fortress-Monastery buried beneath the seas of Verlamion-1. There he underwent the dual crucibles of Astartes transformation and Librarius scrutiny. Unlike many feral-world Psykers whose minds fracture under the precise regimen of the Librarius, Cogidubnus adapted with unusual calm.
The late Senior Lexicanum Karadog recorded in his evaluation:
"The boy exhibits an instinctual awareness of consequence, rare in one raised without law. He listens to the Emperor's silence with the patience of stone."
His steady temperament earned him rapid promotion through the ranks of Codicier and Epistolary. In personal demeanor he is terse, observant, and prone to long contemplations. His battle-brothers often describe him as "the still point in the storm", an anchor of focus amid the Chapter's advances.
Chief Librarian Cogidubnus does not hesitate in the face of the Warp.
