Abaddon, the Destroyer

A fiend who appears to be in pieces currently. Bound by The Empire of Coraar 'ath Revaar to power Gil'lornomin, Progress Engine, currently unknown how this came to pass, but this must have occured at least 1800~ years ago (time estimated from Atlas entry for location and Glittering Chambers being sealed about 1000 years ago).
Seemingly collected by Awarth Gurgoth for reasons unknown.
Known parts:

• Head in Gil'lornomin, Progress Engine
• Hand in lava in the ruins where Dalitar Amakiir was found
• Leg in the hellish location of the Dendomiel, Palace of Treaties portal, guarded by Baalmon
• Heart in Qwyn (destroyed)
• Leg imprisoned in Tharbaduin, Gateway to the Forest 

Also notable was that Awarth took a sort of stone anvil with her alongside the hand.