Long ago, a great fortress built by a cult of the dragon Ashardalon sank into the earth in a forgotten cataclysm. Its ruins became known as the Sunless Citadel, and over the centuries numerous creatures made this place their home.
Twelve years ago, the druid Belak the Outcast discovered the Twilight Grove in the citadels depths. There he found the Gulthias Tree, grown from a wooden stake once used to slay an ancient vampire, and from which sprouts supernatural fruit known to cure any disease.
One month ago, four adventurers from the nearby town of Oakhurst ventured into the Sunken Citadel searching for the origin of the magical fruit. They never returned.