The formation of these bones is beautifully macabre. I think I'll try to rearrange the bones of other risen shadowlords and see if I can't replicate this work of art.
Repeatable
Slay undead.
Dismantle risen Teir'Dal shadowlords (in High Keep: The Bloodless Incursion)
Quest Rewards above are only the guaranteed XP, faction, and coin rewarded for this quest. Status points and rewards limited by class, race, alignment, etc. are unavailable.