From Warhammer 40k - Lexicanum
The Moripatris, known as the Mass of Doom, is a prayer uttered by Chaplains of the Blood Angels. When they discover that a Blood Angel is succumbing to the Black Rage, the Chaplain will utter the Moripatris, formally inducting the Space Marine into the Death Company.
- 1: Codex: Blood Angels (5th Edition), pg. 44 - Death Company
- 2: The Blood Angels Omnibus, pg. 621 - Appendix Angelus