Gloom

Gloom is a hazard in and, being used by the Smoky Progg and the Ancient Sirehound in form of a green and gray gas in  and in  as a red gas. Gloom instantly kills Pikmin.

=In fanon games=

In Pikmin 2... Again
The fog also known as Gloom is a hazard in Pikmin 2... Again?. Being in form of a purple gas due to the poison's color being now as it did on its debut game. The fog is used by the Smoky Progg and the Supreme Dweevil's Mr. Nom. The fog is a extremely dangerous for instantly killing Pikmin with no chance of saving, just like explosions and acid.