Blight Serum

Blight Serum is an Event Add-on available to all Killers. It is no longer available.

Icon	Description	Cost
	THIS ADD-ON IS NO LONGER AVAILABLE (This Unlockable can no longer be obtained and stockpiles can no longer be used. If it is an Event Unlockable, it may return with its associated Event.) A small amount of Compound Thirty-Four, the final serum The Blight had worked on before his transformation. Causes extreme mutations in high doses. Playing as The Blight, you benefit from the following effect: Grants 1 additional Token towards his Power. Playing as any other Killer, Blighted Serum temporarily replaces your Power with the Blighted Rush ability. Press the Power button to dash forwards at 200 % of your default Movement speed for 2.5 seconds. Start the Trial with 1 Token. Receive 1 Token each time a Survivor is hooked.	2,000

Movement speeds

Blight Serum applies an x2 multiplier to the Killer's default Movement speed:

Default Movement speeds	Blighted Rush Movement speed	Ditto in %
3.85 m/s (Nurse)	7.7 m/s	192.5 %
4.2 m/s (Shape)	8.4 m/s	210 %
4.4 m/s	8.8 m/s	220 %
4.6 m/s	9.2 m/s	230 %

Blight Serum was originally added with Patch 4.3.0 for the 2020 Halloween Event The Eternal Blight and could only be obtained for the duration of the Event and every subsequent Halloween Event since.
Unlike the Refined Serum Add-on, the Survivors' equivalent, the Blight Serum cannot be used outside the Halloween Event.
- This is likely because the Add-on needs to be adapted for every new Killer that is added throughout the year, since it temporarily replaces their Power.
Using the Blight Serum on The Trapper grants him the ability to Rush over armed Bear Traps without getting caught in them, albeit disarming them in the process.