This chest spawns as you complete the final Sepulcher raid event: "The Triune God" (see this quest entry for information).
Allu'Gre, Guardian of the Righteous
Ancient Sash of Life Entwined
Blade of Witless Abandon
Choker of Civilization
Dark Drape
En'Theru, Ender of Crimes
Gar'Theru, Bringer of Rewards
Glowing Alaran Periapt
Godblood Droplet
Greater Alaran Periapt
Ostentatious Armwraps of Ryken
Ostentatious Footwraps of Ryken
Ostentatious Handwraps of Ryken
Ostentatious Headdress of Ryken
Ostentatious Legwraps of Ryken
Ostentatious Stole of Ryken
Ostentatious Wristwraps of Ryken
Powerless Trophy of Alsa Thel
Scuffed Journeyman's Pocketed Rucksack
Scuffed Journeyman's Rucksack
Scuffed Traveler's Rucksack
Scuffed Weapon Crate of the Mercenary
Shifting Sphere of Veiled Ascension
Soulbleeder
Thelara`Tel, Icon of the Eternally Faithful