Spawns as you complete the raid event "A Matter of Life and Death" (see this quest entry for details).
Befallen Noble's Aegis
Bloodstained Pauldrons of the Fallen
Bone Mask of Lucid Acrimony
Bosque Imbued Scarf
Burden of Truth
Carillon Box of Lost Songs
Chapterhouse Standard
Cinched Cord of Suffering
Dread Armguards
Dread Boots
Dread Bracer
Dread Gloves
Dread Helm
Dread Leggings
Dread Tunic
Euphony of the Chapterhouse Chapel
Foreigner's Belt
Glowing Terrormote
Greater Terrormote
Lesser Terrormote
Librarian's Signet Ring
Mantle of the Cursed Abode
Median Terrormote
Niteshaid's Earring of Undying Love
Primed Fragment of Fearlinked Zeal
Serviceman's Honor
Trophy of Marnek
Weight of Duty