The Neptune's Nightmare is a community-created cosmetic item for the Pyro. It replaces the Pyro's head with a skull inside an old diving helmet with green tinted glass. Seaweed dangles from the front view port.
The Neptune's Nightmare was contributed to the Steam Workshop under the same name.
- The Neptune's Nightmare was added to the game.
- Neptune was the Roman god of the sea (and freshwater).