Frankenstein

The Frankenstein is a Hardmode enemy that spawns only during a Solar Eclipse, during which they are as common as zombies. Hitting much harder, having more life and walking faster, they can be considered "super-zombies".

They are one of only two enemies that drop the Broken Hero Sword, which is necessary for crafting the most powerful sword in the PC game.

Trivia

 * Terraria continues a common mistake about Frankenstein. Frankenstein is the name of the doctor who created the monster, not the monster itself. The monster is typically called "Frankenstein's Monster", or a "Frankensteinian Monster" for a more precise term.