Halloween Terror is returning to Overwatch for the third year in a row. Blizzard is still keeping the exact details about this year’s Halloween-themed event under wraps, but the developer has provided a hint in the form of a cryptic riddle.

This year’s Halloween Terror starts on October 9 and continues through to October 31. Once the event ends, you’ll have to wait until 2019 to unlock Overwatch’s Halloween-themed content. The only clue we have as to what this year’s Halloween Terror will include and where Junkenstein’s Revenge’s story will go next is a poem and short cinematic included in one of Overwatch’s tweets.

Every year, Halloween Terror offers new Legendary skins for players to unlock–each priced at 3000 credits–that feature Overwatch’s heroes dressed up in costumes, such as Dragon Symmetra. Skins from previous Halloween Terror events are also offered at a discounted price. Several of the maps receive Halloween-themed updates as well, becoming decorated with spider webs and jack-o-lanterns.

Halloween Terror also lets players participate in Junkenstein’s Revenge, a PvE mode where four adventurers assemble to stop the combined forces of Dr. Junkenstein and the Witch of the Wilds–alternate reality versions of Junkrat and Mercy–from taking over the fictional kingdom of Adlersbrunn. In 2016, you and three others played as The Alchemist (Ana), the Gunslinger (McCree), the Archer (Hanzo), and the Soldier (Solder 76). In 2017, the story continued and added The Countess (Widowmaker), the Swordsman (Genji), the Monk (Zenyatta), and the Viking (Torbjorn).

Overwatch is available for Xbox One, PS4, and PC.