The Lost Girl is a monster that can spawn rarely in the Underground and Cavern layers. When the player gets too near, she quickly changes form, becoming a Nymph. New players often get fooled by her name and appearance, and approach her in the hopes of getting a new NPC. However, her second form, the Nymph, is quite strong (300 HP) and her strong attack power (29) can easily kill an unprepared player.
- In Greek and Roman mythology, Nymphs were nature deities that possessed the attributes of various things in nature.
- This may be a reference to the Witch in the games Left 4 Dead and Left 4 Dead 2 due to her behavior and appearance.
- This is the only character-like entity in the game who is naked. (The Dryad is also arguably naked. However, she is wearing vines).
- Increased spawn chance.
- Added to the game.