You see a sarcophagus.
Location
In the rooms the Pharaohs store their helmet pieces, Vampire Crypts.
Notes
A sarcophagus's purpose is to contain a dead body, like a coffin. Perhaps you can find something useful in it.
Unlike the Sarcophagus, this sarcophagus does not open upon using it and does not have a volume.
Such sarcophagi are part of The Ancient Tombs Quest, the Shadows of Yalahar Quest, and the Krailos Quest.