Nymph

The Nymph is a very rare enemy that spawns in the Cavern layer. When encountered, she appears as the Lost Girl, who seems to be a helpless NPC in need of rescue. When a player gets close or attacks the Lost Girl, she transforms and attacks as the Nymph, a dangerous enemy that deals high damage (for a pre-Hardmode enemy).

The Lost Girl will only transform into a Nymph if one of the following apply:
 * The Lost Girl has been hurt.
 * The distance between the player and the Lost Girl is less than 200 pixels, and she has a direct line of sight to the player.
 * The Lost Girl is moving (falling, knockback).

The Lost Girl is immune to the Confused debuff, though the transformed Nymph isn't.

She can be detected by the Lifeform Analyzer.

Tips

 * While she moves fast and hits hard, she cannot attack from a distance, nor can she jump very high. Stay out of reach and use a ranged weapon to dispatch her safely.
 * A Harpoon, Flail, Boomerang or Yoyo can be effective, as the Nymph can be stun-locked. Even with her high health, the Harpoon can kill a Nymph in moments with no risk to the wielder, due to its extremely high rate of fire, so long as it is used at short range.
 * A Hunter Potion, Lifeform Analyzer, or both can be useful for finding Lost Girls.
 * In Expert mode, the Lost Girl has twice the health of a normal friendly NPC. This makes her suspicious even for a first time encounter.

Trivia

 * In Greek and Latin mythology, a nymph is a lesser female deity who served the god of nature, Pan.
 * The Lost Girl sprite appears naked, likely to make her seem more vulnerable and in need of saving.
 * The left half of the Nymph Banner depicts the Lost Girl, while the right half is the actual Nymph enemy.
 * Nymph's hands appear to be stained with blood.
 * The Achievement for killing the Nymph appears to show her in the Lost Girl form.

History
Nymphe Nymphe 宁芙