Jack-O'-Lantern

"Mistaken for wisps by some, the Soot Elementals of the marshlands spring to life suddenly and violently, to die soon after. Yet long-dead travelers prove a good supply of artifacts that can allow them to endure humidity, and thrive on the nutritious fumes of the moors."

"Docile and curious in nature, they'll provide warmth and light to any less unfortunate traveler who treats them to a dry piece of wood or cloth."