Sharn Wall

The Sharn Wall, also seen as Sharnwall, was a shimmering, silver-colored magical barrier in the Anauroch created by the sharn to imprison the phaerimm.

History
In 1371 DR, the Sharn Wall was punctured by an explosion caused when magical bolts fired by Galaeron Nihmedu, a Weave caster, and Melegaunt Tanthul, a Shadow Weave caster, collided. Magic from the Weave and magic from the Shadow Weave mingled with disastrous effects. This freed the phaerimm, an ancient, malevolent, and powerful race that were imprisoned beneath Anauroch by the Sharn after the collapse of Netheril.