Clash of Leviathans

Beware the Mighty Leviathan!

An ancient monster emerges from the depths, freed from its forced slumber by an evil cult. A mighty serpent swims out to meet it, but it will not be enough. You, mighty heroes, must fly to the temple on top of the creature's head, defeat the cult, and return the leviathan to its stony prison.

This is a short adventure for 5e, playable in a single-session. It's primarily a dungeon crawl, inspired by the over-the-top pulp action of the 70s and 80s. The party needs to get to the dungeon, fight some bad guys, deal with some traps, and save the day. Easy! An evil sahuagin cult, including a few merrow and a green hag, has taken control of a giant sea creature that had been trapped in stone for hundreds of years, and are currently in a temple that is fixed to the monster's head.