This quest is not available in game.
Bring the Torn Scroll Fragment, the Crumpled Scroll Fragment and the Singed Scroll Fragment to Theldurin the Lost.
The Scroll of Myzrael...the Scroll of Myzrael?! You don't want that! Its magic can pull Myzrael to the surface world and if you do that, we are in trouble!
Or...maybe it's too late. Maybe she already is free. Maybe she's just gathering strength before unleashing herself upon us. If so, then you'll NEED the scroll!
...too bad it's destroyed. Enraged elementals stole it and tore it up and now fight over the fragments.
But if you can gather those fragments, maybe we can fix it...