Obsidian Entertainment announced that the first Outer Worlds 2 DLC, named Side Effects Guaranteed, will launch on December 2, 2026, for PC, PlayStation 5, and Xbox Series X/S [4]. The release opens a two-part narrative adventure that wraps up in spring 2027 [2]. Players trace a distress call from an abandoned ship, explore an uncharted valley on the planet Eden, and steer the future of a criminal gang trying to survive a lethal contagion. The expansion sells for $14.99 and downloads automatically for owners of the Premium Edition [1].
Outer Worlds 2 DLC Release Schedule
The release calendar splits the new story into two chapters, with the first chapter arriving on December 2 and the second scheduled for spring 2027 [2]. Both parts link together, so choices made in December will shape the plot when the second half lands next year [1].
Side Effects Guaranteed costs $14.99 as a separate download on digital game stores. It also comes included with The Outer Worlds 2 Premium Edition and the Premium Edition Upgrade, which unlock the content at launch without added payments [1]. December brings multiple expansion rollouts, including a December release date for Pokemon Pokopia DLC on Nintendo Switch. For Obsidian’s game, the new questline starts right before the story’s point of no return, letting players pick up from their endgame saves [2].
Players who finished the main campaign do not need to restart from the beginning to enjoy the adventure [3]. Obsidian added a main menu shortcut that loads a pre-made level 27 character with unspent skill points and perks [2]. The shortcut bypasses missing save files and delivers several hours of fresh regional tasks, faction interactions, and branching dialogue across Eden, where the base game first debuted in October 2025 [4]. It saves considerable time [3].
The Setting of Elysium Valley
The adventure starts aboard the Incognito. Intercepting a faint distress call leads the crew to a derelict vessel adrift in deep space, where frozen crew members sit trapped inside cryo-pods alongside a dark puddle that was once a living human [1].
A video log left by the captain explains that her crew contracted a fatal contagion during a recent heist [1]. She calls it “explosive cell death,” though she said the symptoms look far more like total body liquefaction than any fiery explosion [2]. The clues lead straight to Gordon Hazen. Hazen works as a ranking operative in Sub Rosa, an organized criminal network whose members rob rival factions instead of answering to corporate authority [1].
Hazen sends the Commander to Elysium Valley, a forgotten territory located on the planet Eden. The region holds a lonely settlement of former Protectorate subjects who were abandoned by their rulers years ago. Hazen favors peaceful talks with the settlers to find a cure for his dying crew, but another Sub Rosa operative, Algernon Lankester, wants to exploit the colony for personal profit [1]. The player must decide whether to save the infected crew or eliminate the scientist who knows how to treat them [3]. The resulting moral choices shape how Sub Rosa operates in the future [1].
New Combat Flaws and Weapons
Elysium Valley is dangerous. Hostile packs of canids roam the open plains, while predatory primal sprats attack passing travelers with overwhelming physical ferocity, growing to roughly one hundred times the size of the harmless rodents found across Arcadia [1].
To handle these wild threats, the Commander acquires five new weapons. The Immobilizer functions like a gravity gun, lifting targets into the air where they float helplessly against grenades or Tactical Time Dilation shots. The 1/6 Resolver hits hardest on every sixth shot. That rhythm rewards steady aim without forcing players to dump entire magazines. The remaining arsenal includes a heavy Tossball Stick for melee fights, a plasma weapon for energy damage, and a rifle tuned to shred local beasts [2]. Companions also receive new armor sets for protection [1].
The expansion introduces four combat Flaws that bring clear trade-offs to player builds. The “Lethally Tolerant” flaw raises chemical resistance so max toxicity goes up, but experiencing a Toxicity Crash brings instant death. Another option, “Must Have Been the Wind,” tags a specific target during fights; eliminating that target grants a 20% speed and damage bonus, but missing it gives a 10% penalty for 30 seconds [1]. A fourth flaw called “Excessive Shrinkage” cuts the player’s physical size during play [4].
Progression in Side Effects Guaranteed
Level limits rise for the first time in The Outer Worlds 2, raising the cap from 30 to level 36. Reaching level 36 delivers extra skill points to round out specialized builds while opening three additional perk slots, supported by 15 brand-new perks designed to reward different combat roles. The choices broaden endgame builds [1].
Alongside the expansion, Obsidian is rolling out a free base-game update on December 2. It adds a full respec tool, letting users reset perks, skills, and attributes whenever they want to test a fresh playstyle [2]. A custom game slider also adjusts skill points earned per level [3]. Boosting points turns the Commander into an Earth Director powerhouse, while reducing points makes survival far tougher. The options provide complete freedom over character growth [2].
New music also accompanies the trip through Elysium Valley. The update adds a Sub Rosa radio station that plays 20 new songs, giving the criminal syndicate its own presence on the airwaves [1]. Station chatter includes updates and comments about how the faction views the player’s past deeds [4]. The audio design helps Elysium Valley feel like a real place, separate from the settlements of the base campaign [1].
Obsidian Workforce Reductions
The expansion announcement arrives after severe studio turbulence at Obsidian Entertainment, which recently laid off 25% of its workforce. Despite losing a quarter of its staff, the studio pushed ahead with post-launch development on The Outer Worlds 2 to deliver both scheduled expansions without cutting planned features. Work continued on schedule [5].
Xbox Game Studios backed the roadmap [1]. The original game arrived in October 2025, earning high critical praise and a 9 review score for its branching dialogue trees while falling short of commercial sales targets [4]. Obsidian used player feedback gathered during that first year to shape the balance changes and progression features arriving on December 2 [2].
Choices made throughout Side Effects Guaranteed will carry straight into the second DLC when it lands in spring 2027 [2]. Deciding whether to support Gordon Hazen’s diplomatic initiative or back Algernon Lankester’s scheme to exploit the colonists alters the balance of power across Sub Rosa. With five new weapons, extra perks, radio music, and fresh Flaws, the Outer Worlds 2 DLC offers plenty of reasons to return to Eden [1]. The adventure begins December 2 [4].
- PRESS RELEASE Partis, D. (2026, November 10). Side Effects Guaranteed in the First DLC For The Outer Worlds 2, Coming December 2. Xbox Wire. [Article Link]
- WEBSITE Dowling, M. (2026, November 10). The Outer Worlds 2’s first DLC arrives December 2. PlayStation.Blog. [Article Link]
- ONLINE NEWS Huebner, A. (2026, November 10). The Outer Worlds 2 Announces First DLC. Insider Gaming. [Article Link]
- ONLINE NEWS Sinha, R. (2026, November 11). The Outer Worlds 2: Side Effects Guaranteed Out on December 2nd, Adds “Hours of New Content”. GamingBolt. [Article Link]
- ONLINE NEWS Push Square. (2026, November). The Outer Worlds 2 PS5 DLC Split into Two Parts, First in December. Push Square. [Article Link]
