Prison Cell Key

Prison Cell Key is used to open the prison doors that lead to Kharan Mighthammer, Marshal Windsor and Commander Gor'shak. As of patch 4.0.3a the key still drops and opens the cells containing the NPCs; however, doing so serves no purpose, as the quests involving these NPCs have been removed.

It was necessary for the completion of

Source
This key is dropped by High Interrogator Gerstahn in Blackrock Depths.

Note
Only one person may loot the key. Since it is unique, it would go to someone without the key.

Can be added to the Keyring.