Moripatris

Moripatris, known in Low Gothic as the Mass of Doom, is the name of a prayer uttered by the Chaplains of the Blood Angels and some of their Successor Chapters before a battle.

When they discover that one of their Astartes has begun to succumb to the genetic curse of the Black Ragem the Chaplain wull utter the Moripatris, which marks that Astartes formal induction into the Chapter's Death Company.