Andrealphuas, translated from its Calabanite origins, means 'Transformation to the Crow'. This unusual name was awarded to the Librarian upon his ascension into the Deathwing in recognition of his unusual talent of transforming his enemy psyker's into bitter, black crows.
Andrealphuas earned his place amongst the first company during Abbaddons 13th Black Crusade on the lost world of Greygorn. The banner the Librarian wields is a remnant of the felled Titan Bastos.
So much work, so much effort; very rewarding outcome. I may have burnt the banner a little too much but it fits the theme.