Haunting Memento
Sold by Chester. Using this on a player gives them a 15 minute buff that "haunts" them with a random assortment of spooky effects.
The 
Haunting Memento is a toy that applies a 15-minute buff with random spooky effects, purchasable from Chester in Darkmoon Island for 90 Darkmoon Prize Tickets.
Guide awaiting review
Purchase from Chester
Find Chester at 51.2, 75.0 in Darkmoon Island and buy the Haunting Memento for 90 Darkmoon Prize Tickets.
Use the toy
Use the Haunting Memento on yourself or another player to apply a 15-minute buff. The buff triggers random spooky effects including transformations into a Plague Beast, skeleton, or suit of armor, summons of giant spiders, ghostly appearances, or visual phenomena like swirling souls or purple vortexes.
