Vampire

Vampires are a Hardmode enemy that spawns only during a Solar Eclipse, during which they are as common as a Zombie. Vampires will turn into a bat if the player is above them, and attempt to fly near the player and turn back into a humanoid.

Tips

 * Because of the low lighting during a Solar Eclipse, it may be difficult to see this enemy before they strike you, as they have a habit of flying in as a bat, which is relatively hard to see without artificial lighting. Try using light buffs(Shine Potion, Wisp in a Bottle) if you intend to solo a Solar Eclipse, and watch for them as they fly in to prevent unnecessary damage.
 * The Stake Launcher is a highly effective weapon against vampires, as they do extreme amounts of damage against them.