Avadon 2: The Corruption is the second part of the Avadon trilogy from Spiderweb Software, who also brought us the award-winning Exile, Geneforge, and Avernum series. You can get Spiderweb Software games directly from the site and also at GOG.
As a Hand of Avadon, the Black Fortress, you once held unlimited power. Your word was law. Your homeland was united and prospered under the protection of the Black Fortress. Now that fragile alliance has collapsed. Rebellion rages, outside enemies gather, and Avadon lies in ruins. Will you fight to restore your power and bring peace to your realm, or will you join the rebels and forge a new nation? The decision will be yours in Avadon 2: The Corruption. The game is an epic fantasy role-playing adventure in an enormous world. Choose from five different types of characters, each with dozens of unique spells or skills. Explore a gigantic world filled with secrets, artifacts, and a rich story. Experience multiple different endings and choose between saving your homeland and betraying it.