Lair of the Clockwork Mage (5E)

From publisher blurb: A 5th Edition Mini-Dungeon adventure for 4 characters of level 8 In a lost tomb beneath the capital city, the last resting place of ancient kings and queens is defiled. A wizard with a heart of crystal and iron resolve seeks the secret of the kingdom’s might. This knowledge lies safely in death with the land’s past rulers, but it is only a matter of time before they yield and their souls give up the keys to the kingdom.