This year's Dead by Daylight Hallowed Blight event, called Withering Blight, was leaked during the Stranger Things event over the summer. That said, only the existence of the Halloween event was leaked. Since then, we've learned a little bit more.
The event will run from October 22 to November 1. Not only will it bring "spooky decorations" to the world of Dead by Daylight, but items from Halloweens past, including:
Per the game's official blog:
You can find these limited-time items scattered throughout newly generated Bloodwebs and in chests for the duration of the event. You will keep any leftover items and be able to use them year round, but be warned: Any unused Pustula Petals will stay in your inventory, but will not be useable after the event period.
Following feedback from the Hallowed Blight event last year, Pustula Petals will instead create a pair of event Hooks and Generators for each Offering used. Survivors who burn one of these Offerings will receive bonus Bloodpoints whenever an event Generator is powered, and Killers receive a bonus each time a Survivor is hooked on a special event Hook. If you don’t burn an Offering, you’ll still receive some bonus Bloodpoints, but not as many as those who do.
The event will also bring new challenges and rewards to Dead by Daylight. Putrid Serum will be a new currency for the event, which can be used to acquire cosmetics. Though there are a finite number of these items in the event, finding them all will net you "six hallowed cosmetics."
Last year's event featured an adrenaline-filled rush to gather antitoxins to fend off an army of mutated creatures bent on destroying everything in sight, plus the slightly less tense inclusion of new items and gear.