Break the Holy Vaults
Centuries ago, during the Age of Dragons, a potent and vain blue dragon named Rah-Ziel brought down his final foe, a copper dragon whose name is lost to time. Believing himself immortal, Rah-Ziel left the body of the dragon as a solemn reminder of his power. Those who resisted the grip of the tyrant decided to salvage what they could from the corpse of the copper dragon and used the bones, skin, and horns to create magic items designed to bring about Rah-Ziel's destruction. Now, the characters are hunting for these relics, one of which is stored in the holy vaults of The Theocracy.
A 5-10 hour Dungeons & Dragons 5th Edition adventure for 11th-16th level characters