Nymph

The Nymph is a rare cave monster that can be found in various biomes. Her location has been confirmed in Underground Snow Biome, in the Glowing Mushroom Biome, at the lava level, and in the Jungle. The Nymph is initially disguised as a Lost Girl, pretending to be an NPC, which when approached turns hostile and starts attacking the player.The Nymph is a very fierce mob to deal with it for it's 300 health and also alot of people fall for it being Lost Girl