Before you is one of the mightiest of the guardian demons.
chains of imprisonment
Cloak of Demons
Key of Gr'staka
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Gr'staka is in Blasted Lands, the easiest way to get to him is to astral/portal to fabric dealer and just track him. You will fall into a DT on the way unless you have fly. In the Pharaoh's Room, you will need to open sarcophagus. Some of the rooms around Gr'staka have damage progs every now and again, so move through quickly.
The easiest way to get back to DH is to track Bahamut.