Will-o'-the-wisps

[Unsolved_]

wisps spawn in forests at night, near players. they come in many colors, have a cute face, and disappear when the player gets too close. they wouldn't drop anything because you're not supposed to catch them.

[Maelstrom]

But will o' wisps lure people to traps, usually with intent for the person's demise.  Not sure how easy that would be, and not sure how true to the setting that kind of critter would be.