<class>, listen closely. Now that we have the location of the last amulet piece, we still need another component to suffuse the brazier with; something that will provide a focus strong enough to summon the remains of my deceased, former comrades.
The siblings, Jarien and Sothos, were believers in the way of the Scarlet Crusade. They aspired to knighthood within that vile organization. Go to Tyr's Hand in Eastern Plaguelands and retrieve a Brilliant Sword of Zealotry from the praetorians there.
A job well done, <name>. I will imbue the essence of the sword into the brazier.
Now all that is left is to get into The Crimson Throne inside The Scarlet Bastion at Stratholme, and use the brazier to summon forth the remains of my former cohorts, Jarien and Sothos. Their souls have been twisted further by their possession of Valthalak's amulet piece and his spirit within.
Oh, by the way, I had some leftover bloodkelp from your trip to Alcaz Isle, so I made it into some potions for you. Take your pick!