The power of the Dark Iron forces and their Twilight's Hammer allies is growing within Blackrock Mountain. Pyromancer Loregrain, a magus of renown, plays an important role in leading the Twilight's Hammer forces there. If we could get our hands on his grimoire, I might be able to devise counterspells and other ways of dampening their elemental magics.
You must descend into Blackrock Depths, locate the Shrine of Thaurissan, and capture the grimoire. Show Loregrain and his Twilight minions no mercy.