Skeleton sets (or Spooky sets) were Holiday rewards received from the 2015 Hallowe'en event. The costume gives no bonus to any statistics.
In order to receive the set pieces, players had to contribute to the killing of the Jack-O'-Skelton boss. The pieces are a 100% drop upon the player's first successful killing of the boss.
The various parts of the Skeleton Set could be used as part of a player's costume during the 2015 Hallowe'en event. The Skeleton Set consists of the following: