You see Greed
Notes
Appears with The Hunger and with the World Devourer in the Heart of Destruction Quest.
Abilities
Damage Taken From Elements
Physical 
Death
Holy
Ice
Fire
Energy
Earth
Location
Otherworld, here and here.
Behaviour
Unknown.
Strategy
Greed appears in the room with The Hunger and World Devourer. They seem to be immune to all damage, so focus on your battle with The Hunger and try to stay diagonal of them when possible. Alternatively, you can lure The Hunger through the teleport in the middle of the room, then walk the Greed over it to make it disappear. In the room with World Devourer, it is highly recommended to lure the World Devourer over the teleport in the middle and then let the Greed walk over it so they disappear. Otherwise, your team will be swarmed with Greeds.