This quest is not available in game.
Bring the Hands of Lucifron, Sulfuron, Gehennas and Shazzrah to Duke Hydraxis in Azshara.
<name>, your service is of great value to us, so we are reluctant to send you on this last mission for we do not want to lose such a useful agent.
But its success would further our war efforts tremendously and... it was deemed worth risking you.
We want these captains in the Molten Core destroyed: Lucifron, Sulfuron, Gehennas and Shazzrah. Kill them and bring me their hands!
This task will take every resource you possess, <name>, but if can do it then the Firelords will be dealt a terrible blow.