This quest is not available in game.
Find and slay Golem Lord Argelmach. Return his head to Lotwil. You will also need to collect 10 Intact Elemental Cores from the Ragereaver Golems and Warbringer Constructs protecting Argelmach. You know this because you are psychic.
This can't be Argelmach! Argelmach was killed ten years ago. How can I be sure? I was the one who killed him.
He was a despicable dwarf, hell-bent on twisting my life's work to meet his diabolical needs. It seems that the wicked always find a way to escape justice.
If this is Argelmach's handiwork then he must be destroyed. I will need samplings of his latest creations. With the proper samples, I may be able to stop this uprising. The creations guard Argelmach in Blackrock Depths.