The Tower of Zenopus

The tower was once the fortified lair of an eccentric
wizard named Zenopus. When the wizard vanished,
travellers began to go missing around the tower, and
Saltmarsh Council commissioned a passing warship to
reduce the stronghold to dust.
All that remains now is a battered ruin, but rumors
persist of an intricate subterranean complex said to
hold countless treasures and magical artifacts.