Headless Horseman

The Headless Horseman was an NPC in the center of the hill during the Halloween event. If you were to come near him you would've seen his available items, that haven't been bought by any other players. Prices for his items varied between all servers, and restocked hourly so all players had a chance to get something new. He is notable for one of his items being the famous Inferno Box.

There is also a collectable decoration that he sold, being a 1x1 statue of himself.

Headless Santa
Santa is also the Headless Horseman in disguise berezaa said on Twitter the Horseman would be back "sooner than we'd expect." and later confirmed that they are one and the same.

He sold the Santa's Sleigh, inferno boxes, Freeze-Ray Tech, and a free Neon Gift of Glowing.