Obsidian Entertainment has officially announced Side Effects Guaranteed, the first major story expansion for The Outer Worlds 2, launching on December 2, 2026, for PC, PlayStation 5, and Xbox Series X|S. Priced at $14.99, the DLC introduces a new region, additional weapons, expanded character customization, and a storyline where player decisions will directly influence a second expansion scheduled for Spring 2027.
According to the official Xbox Wire announcement, the expansion begins when the crew of the Incognito intercepts a distress signal from an abandoned spacecraft. Upon investigating, players discover several individuals suspended in animation after exposure to a mysterious substance capable of causing catastrophic cellular destruction. Their search for a cure leads to Gordon Hazen, a member of the criminal organization Sub Rosa, who directs the player toward Elysium Valley, a previously unexplored region on the planet Eden.
The new location introduces a settlement populated by former Protectorate subjects abandoned by their government. Players must navigate conflicting interests between Gordon Hazen, who prefers a diplomatic resolution, and Algernon Lankester, another Sub Rosa operative seeking to exploit the settlement. Decisions will determine the future of the survivors, the endangered spacecraft crew, and the criminal organization itself, with consequences carrying into the next expansion.
Beyond the additional narrative content, Obsidian is expanding character progression and combat mechanics. The maximum level increases from 30 to 36, providing additional skill points and 3 more perk selections. Players will also gain access to 15 new perks and 4 flaws, introducing additional opportunities to customize character builds.
One example is Lethally Tolerant, which increases maximum toxicity resistance but causes instant death if the character experiences a Toxicity Crash. Another, Must Have Been the Wind, introduces an assassination target mechanic that rewards successful eliminations with a 20% damage and movement speed bonus while penalizing incorrect attacks.
The expansion introduces several additional gameplay features:
| Feature | New Content |
|---|---|
| Release Date | December 2, 2026 |
| Price | $14.99 |
| New Region | Elysium Valley, Eden |
| Level Cap | Increased from 30 to 36 |
| New Perks | 15 |
| New Flaws | 4 |
| New Weapons | 5 |
| Additional Enemies | Canids and primal sprats |
| New Audio Content | Sub Rosa radio station with 20 songs |
| Next Expansion | Spring 2027 |
According to the PlayStation Blog, the new weapons include the Immobilizer, which suspends enemies in the air, and the 1/6 Resolver, which delivers enhanced damage with every sixth shot. Players will also encounter oversized primal sprats, additional armor equipment, and new outfits for companions.
Importantly, players will not need to complete the original campaign to access the DLC. Obsidian is introducing an alternate starting option that allows players to begin the expansion directly using a predefined level 27 character, with customizable skills and perks. Existing characters can access the story before the main campaign's final point of no return.
Alongside the paid expansion, Obsidian will release a free update for all The Outer Worlds 2 players, introducing the ability to reset character builds at any time. The update also adds a custom game setting that allows players to adjust how many skill points they receive when leveling up.
Side Effects Guaranteed is included with The Outer Worlds 2 Premium Edition and Premium Edition Upgrade, which provide access to both planned expansions. Players who own the standard edition can purchase the first DLC separately through supported platforms, including Steam and the Xbox Store.
Side Effects Guaranteed appears to be a meaningful expansion rather than a small collection of additional missions. Increasing the level cap, introducing new gameplay mechanics, and making player decisions carry into another DLC are positive developments for an RPG built around character customization and narrative consequences.
The decision to introduce a free character respec system is particularly welcome. Players should have the flexibility to experiment with different builds without being forced to restart an entire campaign, especially in games where perk combinations significantly influence combat and dialogue options.
However, the $14.99 price should be evaluated against the actual length and quality of the expansion, which Obsidian has not yet detailed. While the additional weapons and progression systems are promising, meaningful quests, exploration, and player choices will ultimately determine its value.
Connecting both expansions through a shared storyline is also an interesting approach, provided the first DLC delivers a satisfying experience independently rather than feeling like an incomplete chapter.
For PC players, continued optimization and long term support remain equally important. Expanding gameplay content is welcome, but maintaining performance and improving existing systems should remain part of Obsidian's development priorities.
Will you purchase Side Effects Guaranteed for $14.99, or do you prefer waiting until both expansions are available before returning to The Outer Worlds 2?
