This is an NPC, or a non-player character.
The Ghosts of Winterfest Past were introduced during WinterFest 2016. It is a variant of the Ghost. During WinterFest, all regular Ghosts are replaced with the Ghosts of Winterfest Past, which will freeze a player upon contact but appear faintly without Spectral Goggles or Synthetic Oculum.
Upon contact, the player will shout out one of the following things:
- It's the ghost of Winterfest past!
- I feel a chill in the air!