This mob popped today while I was looking for the Fabled Fiery Thought Leech.
Dropped the following:
Runic Card Crystalline Idol Delicate Glass Sculpture Ancient Tablet Mark of Grace Mark of Hope Brazier of Light Fire Scorched Stick Mark of Contention Mark of Opposition Mark of Gallantry Mark of Valor
Second kill, dropped the following:
Mark of the Noble Mark of Valor Mark of Darkness Mark of Shadows Gem of Blue Skies
Third kill dropped the following:
Light Etched Fire Opal Light Etched Peridot Mark of Purity Mark of Piety Mark of Pride (x2) Mark of the Siege