The frigid valleys of the Dragonspine Mountains echo with the desperate plea of terrified miners: "Heroes of the Forgotten Realms, save us from evil!" Unwittingly digging in unhallowed ground, they have disturbed an ancient vault and released its terrible content. Scores of horrific creatures now infest the mine shaft -- and threaten to escape into the world above! You and your heroes must find the way to contain this scourge. All hope depends upon your ability to unravel the age-old mysteries surrounding this vile infestation.