The Skull Trooper is one of the most iconic skins in the game. It came out last halloween and was considered an "OG" skin. It was considered "OG" because of how old and rare the skin is. Not many people had bought the skin because of how new the game was and people werent sure whether or not they would play for a while. They just recently released the skin again and 100's of thousands of people bought it making the rarity of the skin decrease significantly.