Dungeons and Dragons 5e: Expedition to Castle Amber
A Forgotten Realms adventure for 4-6 3rd level characters.
Slaying the dragon was easier than expected. Your new companion is tougher than he looks. He also didn't join you for the gold. He wants to hire you for a dangerous expedition in to the heart of his homeland. He claims to be a prince of the far-off kingdom of Amber. His tyrant brother usurped the throne from him and terrorizes the kingdom. He uses his necromantic magics to raise the dead in an army that may someday threaten the Realms.
Deep in the dungeons of Amber is a font of power called the Pattern that rivals the Pool of Radiance. It is well-guarded from any assault through the castle, but Prince Eric knows a way to reach it through the Underdeep and if he can reach it, he can use its power to set his people free from the tyrant: Corwin of Amber.