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

 * The Hellhound is a reference to the enemy found in the game "The Elder Scrolls V: Skyrim". This enemy is commonly found with vampires, as is the Terraria version, and both are nearly identical in appearance.
 * The Hellhound may be a reference to some cultures, where they signify death.