Plunger

Plunger is a gun that fires a stream of poison. It has a chance to poison enemies, and it leaves poisonous goop on the floor whenever it hits an enemy or wall. Reloading while standing on any goop (including its own) fully restores the gun's ammo.

Trivia

 * The phrase Médecins Sans Diplôme in the description is French for Doctors Without Diplomas. This is a reference to the real-life organisation Doctors Without Borders, commonly known as Médecins Sans Frontières.
 * The accented letters in the description don't display right on Switch—“Médecins Sans Diplôme” shows as “Mdecins Sans Diplme”.