Red Devil

The Red Devil is a hardmode enemy that spawns in The Underworld after either The Destroyer, The Twins, or Skeletron Prime has been defeated. It can be considered a harder version of the Demon.

While the Red Devil itself does not cause much contact damage, its trident attack is capable of dealing large amounts of damage even to players in Hallowed armor, Chlorophyte armor and Turtle armor. The tridents are similar to the Demon's scythe attack, but do more damage and do not accelerate.

The Red Devil is immune to the On Fire! debuff.

Tips
If u fart it dies
 * To defeat it, attack only while it charges his tridents. While he shoots, focus on dodging only, as receiving more than 4 hits will probably kill you.
 * In the Xbox 360 edition, If you defeat one of the Mechanical Bosses before the latest update, they won't spawn.