Nymph

The Nymph is a rare enemy that spawns in the caverns. When first encountered, it will appear with the name Lost Girl and pretend to be a helpless NPC that needs to be be saved. When you get close, however, it will transform and attack as a Nymph.

Tips

 * It is recommended that players with low-end equipment take caution around or avoid these enemies, as they are very difficult to defeat and do high amounts of damage to weaker players. If you must engage, it is recomended that you use a ranged weapon.
 * Nymph uses standard Fighter AI. She can't jump very high or go through walls, so players can use this to their advantage by staying behind walls or on top of tall cliffs. Even with weak throwing weapons, it's easy to stay completely out of her range while still dealing damage.
 * Minions and other enemy seeking weapons will target the Lost Girl before she transforms into a Nymph.
 * It is easier to fight with the Harpoon, as it can be stun locked.

Trivia

 * The Lost Girl is the only humanoid NPC to appear completely naked.
 * Unlike in Terraria, a nymph in Greek and Latin mythology is a lesser female deity with the power to animate nature.
 * The Nymph is possibly (though unlikely) a reference to the Canadian supernatural series Lost Girl in which Nymphs are natural creatures that often attack humans. [source]
 * The Nymph's behavior may be derived from Left 4 Dead's Witch.