Towers of Night (d20)

From the introduction: An adventure for four 1st-level player characters...When the Lord of Sloth came to Zeland, the nobility of the Battleplain vanished. Currently, two beings view this region with interest: Beryn, a necromancer of little repute, and Drokag, a Hobgoblin with dreams of grandeur. They have come to desecrate the Towers, seeking to raise an army of undead. Their purpose is merely to gain favor in the eyes of the Lord of Sloth and his Generals. It will be up to the players to stop this little plot before it gets out of hand.