Hellhound

The Hellhound is a Hardmode, post-Plantera enemy summoned during the Pumpkin Moon event. It follows the Unicorn AI and will run quite fast at the player; the player will be barely able to outrun them with Lightning Boots. This can make them a very dangerous enemy. The Hellhound has high health, as it would take at least 11 hits from The Horseman's Blade to kill it.

Trivia

 * Hellhounds are mythical beasts form Norse mythology that are said to be the guard dogs of the underworld.