Need to barter your [Tayil's Sealed Scroll] for information about void magic in form of an [Expungement Void Spell Scroll] and [a Bag of Shadow Runes] for 'Elements of Destruction: Shadow Casting in the Dark'.
Level 117^^ zombie - Drops a [Shadow Gem] needed to dissolve the storm barrier. - He, like all members of the Sect of Dark Maw, has to be defeated to make the void storm barrier vulnerable.