The Hereticus Tenebrae is a prophecy that speaks of the Tyrant Star being the horrific harbinger of ruin and desolation. The prophecy reads that there will be signs and portents that herald the events that will gradually transmute human minds and make them ready to embrace the darkness of the Tyrant Star. Investigation of the Hereticus Tenebrae is lead by the Tyrantaine Conclave headed by Lord Inquisitor Zerbe, though much is obscure about the prophecy one things sure and that is its validity. The Tyrant Star has been sighted eighteen times to date in the Calixis sector appearing as a black sun wreathed in a halo of black flames that engulfs a systems normal sun, but it has also been spotted as a strangely bright star at night, or a fleeting glimpse in a mirror or a puddle. Each coming of the Tyrant star has caused massive earthquakes, volcanic upsurges, periods of revolution, more psykers will be born of become active and mutations will occur. Other signs and portents will be widespread; these are generally birthmarks, odd runic sigils appearing upon walls and the rise of fanatical cults.