Temple of the Drowned Bell

The Temple of the Drowned Bell is a sunken temple under a lake, full of fish and riddles.

The Temple of the Drowned Bell is a sunken temple under the clear water of a lake. Shells cover its columns, fish swim through its halls, and a great bronze bell still rings at midnight.

The DM can let the party breathe underwater with a potion or a spell, then fill the temple with riddles, a guardian, and a treasure at the bottom of the deepest room.