The Headless Horseman is a very fast and dangerous enemy that can rush at the player and deal large amounts of damage. It is an exceptionally dangerous enemy due to its fast speed, high damage, and immunity to knockback. The Horseman's only attack is to charge forward and do a low, but quick jump to reach the player.
Headless Horsemen are immune to all debuffs. Killing a Headless Horseman during the Pumpkin Moon event will add 25 points.
The Headless Horseman will flee at dawn unless it gets damaged by the player. However, In the Mobile version, it does not flee at dawn.
Drop chance increases linearly with the wave it is in (lowest drop chance in wave 9, highest drop chance in wave 15).
Despite having the name referring to the Headless Horseman, The Horseman's Blade is not a drop from the Horseman, but the Pumpking
Tips
Due to its size, it cannot fit through 4 tile gaps or lower and can be taken out easily with ranged attacks.
Due to its immunity to knockback, it is ill-advised to attack it with close-range weapons since it can easily overwhelm the player. Hitting it with rapid fire weapons can still slow it down, however.
Similar to most of the Pumpkin Moon enemies, making an arena where you have plenty of space to fly around in can make it easier to take down. It is also possible to place some Wood Platforms high above the ground to fire down on it without fear of it reaching you, but a sufficiently long platform may allow more to spawn on it instead.
Its immunity to knockback can be used against it with weapons that do continuous damage, such as the Inferno Fork.
As it uses the same AI as the Unicorn enemy, it can be useful to practice avoiding the attacks of multiple Unicorns beforehand.
Trivia
The Headless Horseman originates from a short story published in 1820 called "The Legend of Sleepy Hollow" By Washington Irving.