After the Dragonborn is appointed Thane of Whiterun for slaying a dragon attacking Whiterun's Western Watchtower, they are approached by an imperial courier named Theodyn Bienne. The courier states that he is tasked to find the Dragonborn as soon as possible for his assistance to an urgent problem concerning a dragon.
Upon speaking with Lurius, he states that a troublesome dragon is attacking settlements throughout the holds of Skyrim and is threatening and driving away business and trade. He tasks the Dragonborn to finding and recruiting 4 mercenaries of various backgrounds to aid him in slaying the dragon.
After recruiting the mercenaries, Lurius reports that the dragon is spotted roosting in Ancient's Ascent. The Dragonborn, along with the recruited mercenaries, then attempts to ambush the dragon but the ambush is unsucessful.
Before the dragon leaves, he states that the Dragonborn should head for an island called Wyrmstooth if they wish to meet him in battle.
After reporting the message to Lurius, the Dragonborn, Lurius, and the mercenaries then head for Wyrmstooth to track down the dragon and uncover the mysterious plot of the dragon Vulthurkrah.
The mod first takes place in Skyrim. But after the first quest, the Dragonborn is tasked to travel into the island of Wyrmstooth, where it is threatened by a dragon by the name of Vulthurkrah, Wyrmstooth's main antagonist.
Wyrmstooth is a small island north off the coast of Solitude. It's geography consists of mountains, snow and grass plains, and snowy tundras. Strange flora also thrive in the island itself, such as giant mushroom trees in the western part of the island.