Red Barrels’ The Outlast Trials is getting into the holiday swing with the launch of “Project Messiah”, the newest content for the co-op psychological horror title. The DLC also marks the start of Season 5 content, which also reintroduces the limited-time event, WINTER KILLS: an experimental form of therapy purposefully set in hostile, unstable environments, rich in both punishment and rewards.
Project Messiah introduces Sister Liliya, the newest Prime Asset. On a mission from God to absolve players of their sins, Sister Liliya haunts the snowcapped opulence of The Resort, the newest trial environment that offers a new trial and MK-Challenges, along with her own exclusive Deluxe Catalog.
As for WINTER KILLS, the event brings with it new Variators that are now available to all Reagents:
- PERMAFROST — Permanent freezing temperature in the Trial. Locate heat sources to stay warm.
- FROST MINES — Gas mines have been replaced with Frost Mines.
- COLLECT THE GIFTS — Collect all the gifts in the Trial to earn extra rewards.
As well, the WINTER KILLS Event will take place in two distinct sequences:
Part 1 — December 9, 2025 @ 10am ET — December 23, 2025 @ 9:59am ET
Part 2 — December 23, 2025 @ 10am ET – January 6, 2026 @9:59am ET
The Limited-Time Catalog for WINTER KILLS is also here, available solely for the duration of the Event and featuring exclusive cosmetics and other items. These items can be acquired by exchanging Event Tokens, and access is free to all players through the duration of the event. And as an extra bonus, several new items are now available for purchase in the Murkoff Store, including 11 brand-new Deluxe Outfits and the Event Catalog “Prime Time (2025)”. As well, streamers can enjoy a selection of Twitch Drops, exclusively available from December 9th to January 26th.

Season 5 also provides a comprehensive update to the recently-introduced PvP Invasion mode, including revamped gameplay, fine-tuned objectives for Imposters, balancing for both Imposters and Reagents, and the addition of new Seasonal Rankings. This ranking system offers unique rewards for participating in Invasion mode: completing matches raises your Invasion Rank, whether playing as Imposter or a Reagent, and the grade received at the end of each Trial determines the total amount of Rank Points awarded.
The Outlast Trials is available on PC via Steam and the Epic Games Store, PlayStation, and Xbox.
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