First Campaign: Baldur's Gate the start of the alliance.

Outside Baldur's Gate, Amrod, Kaon, Nilbarad, and Tartarus are on the **Trade Way**, and learn that since the collapse of **Xantam's Guild**, the route has become increasingly dangerous due to the rise of the **Red Fang Marauders**, a goblin army who prey on travelers. After infiltrating a nearby Marauders cave, and freeing the caravan guard Randalla, the heroes head to **Wayfork Village**, a nearby fiefdom. There, they rescue the village from the Marauders and kill their hobgoblin leader, **Harnak**.

Upon entering Baldur's Gate, Randalla hires them to investigate a series of murders in the city. At **Bloodmire Manor**, they learn that **Luvia Bloodmire** has been combining the body parts of various creatures in an attempt to make a new species, and has been giving her creations to **Lady Arogazia Firewind**. Her first creation, **Argesh**, has set up the **Hands of Glory**, a thieves' guild faction of the Marauders. The heroes kill Argesh, crippling the Hands of Glory, and infiltrate the main base of the Marauders. There, they defeat but do not kill the **Red Queen**, leader of the Marauders. They follow her to Lady Arogazia's manor, and learn that Arogazia is a member of the **Zhentarim**, a criminal network intent on ruling **Faerûn**. She has been using the Marauders in an effort to bring back the **Onyx Tower**. Along with her associate **Kharne** (a former member of Xantam's Guild) Arogazia escapes from the heroes, revealing herself as the polymorphed form of the **red Dragon, Aizagora**.

Impressed with their efforts, Jherek, a member of the **Harpers**, requests that the heroes find four elemental objects. Meanwhile, the Zhentarim are also trying to attain the objects to reactivate the Onyx Tower. During their journey, the heroes encounter **Sleyvas**, the humanoid lizard. He too is working for the Zhentarim, and the heroes kill him.

After the four return to town, Jherek enlists them for a journey to each of the **Elemental Planes** to activate the **Elemental Foundations** using the four objects they recovered. In each plane, they are attacked by the Zhentarim, who are in control of the Foundations. Luvia Bloodmire and Aizagora attack them, but are defeated. Upon returning from the final plane and speaking to Jherek, they are approached by Kharne. He tells them the Zhentarim no longer wish to reactivate the Onyx Tower, and that the Harpers and the Zhentarim have a common enemy. **Mordoc SeLanmere**. Mordoc believes he can use the Tower to bring about the downfall of Baldur's Gate, which will please his "allies in the east." His steward, **Xanhast**, interrogates **Vahn**, **Adrianna** and **Kromlech**, finding they know little of the larger scheme playing out. Kharne, Jherek and the four adventurers storm **Mordoc's Keep of Pale Night**. They rescue the trio of adventurers, forcing Mordoc to speed up his plans, and relocate the Onyx Tower into Baldur's Gate ahead of schedule.

Now called **Mordoc's Gate**, the entire population of the city are turned into zombies. The four adventurers attack the Tower, kill Xanhast, and attack Mordoc in the **Elemental Plane of Shadows**. After killing him, they destroy the **Onyx Heart**, supposedly destroying the Tower forever. This releases the citizens from their zombification, and led by Randalla, they thank the heroes for saving the city. Meanwhile, in a room faraway, a servant tells a stone sarcophagus that Mordoc has failed and Baldur's Gate still stands. The sarcophagus says that Mordoc's failure will not interrupt "my sacred mission", and orders his servant to prepare the army and ready his sun barge.