If you look at the marshes on summer nights, you will sometimes see little lights hovering above the weeds. Some people say they are marsh gases that burn, others say that they are the souls of children who died but cannot rest.
They play in the marsh, and lure people into danger. If you ever catch one in a jar, it will cry and knock at the glass, begging to be let out.
This is an original story, based on the legends of the will-‘o-the-wisp: Mysterious Britain: Will o’ the Wisp I really enjoyed the idea of children running into the marsh to catch them, much like children catch fireflies to keep overnight in a jar.