The advent of the Black Rage is associated with the end of the Horus Heresy, caused by the psychic shock felt by every Blood Angel when Sanguinius died at the hands of Horus. Prior to then, the Red Thirst was a rare but dreaded phenomenon, known only to Sanguinius and some members of his inner circle, including First Captain Raldoron, Sanguinary Guard Commander Azkaellon, and High Warden Dahka Berus. On the rare occasions when a Battle Brother was lost to the Thirst, his armour's company markings were blotted out by black paint, and his geneseed was removed for analysis, rather than being returned to the Legion's stores.[2]
The advent of the Black Rage is associated with the end of the Horus Heresy, caused by the psychic shock felt by every Blood Angel when Sanguinius died at the hands of Horus. Prior to then, the Red Thirst was a rare but dreaded phenomenon, known only to Sanguinius and some members of his inner circle, including First Captain Raldoron, Sanguinary Guard Commander Azkaellon, and High Warden Dahka Berus. On the rare occasions when a Battle Brother was lost to the Thirst, his armour's company markings were blotted out by black paint, and his geneseed was removed for analysis, rather than being returned to the Legion's stores.[2]