Cragos the Godslayer

From the Introduction: Cragos the Godslayer is a standalone encounter designed for five 10th to 12th-level adventurers. The people of Coltaris is under attack by an elder dragon named Colytariaz, who has sent her champion, Cragos the Godslayer, to disable the city’s magical defenses. The players must fight off Cragos and reset the city’s shield in a multi-phase solo encounter.