This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Gather the Incendicite of Incendius, the Ember of Emberseer and the Cinder of Cynders, along with a Hallowed Brazier, and return them to Bodley inside Blackrock Mountain.
In order to summon Lord Valthalak we're first going to need to gather the other two-thirds of the amulet. To do that we need to get a brazier and some special coals to burn in it.
There are three nobles of fire, Lord Incedius in Blackrock Depths, Pyroguard Emberseer in Blackrock Spire and The Duke of Cynders in Silithus, with what we need. Collect from each a piece of their remains, and then return to me with a Hallowed Brazier, which can be purchased from the Argent Dawn if you are honored by them.
It was our folly... our doom that we took that last job. If only we hadn't inadvertently stolen Lord Valthalak's spirit, which was contained in the amulet; if only there weren't those in our mercenary group that had been so greedy and divided it up amongst themselves. I'd be alive today, maybe tossing back a beer, or tossing one of my kids into the air.
<name>, don't let the avarice of the ignoble in our old mercenary company be your doom as well.