The Outer Worlds 2 Side Effects Guaranteed: Release and What's Inside

After meeting the huge anticipation generated by the release of The Outer Worlds 2, Obsidian Entertainment is getting ready to expand the universe of the game with its first story DLC, Side Effects Guaranteed. The new expansion was announced on November 10, and it will arrive on December 2 according to a publication on Xbox Wire. It will bring a new region to explore, additional weapons, new character-building options and a story involving the criminal organization Sub Rosa. The release is also the first half of a larger, two-part expansion. The second installment is currently planned for spring 2027, meaning players will have more adventures to look forward to after completing the new content.

Here's everything you need to know before heading back into the Halcyon system.

Release date and price

Side Effects Guaranteed launches on December 2, 2026, with a standalone price of $14.99. Players who own The Outer Worlds 2 Premium Edition or the Premium Edition Upgrade will also have access to the expansion. This is the first of two planned story expansions. While the first chapter arrives in December, the second part is scheduled for spring 2027. The two-part structure means that Side Effects Guaranteed is not simply an isolated collection of side missions. Its events and decisions will help establish the direction of the next installment, giving the expansion a more significant role in the game's ongoing narrative.

Elysium Valley and the Sub Rosa story

The biggest addition in Side Effects Guaranteed is Elysium Valley, a completely new region featuring unique quests, facilities and characters. The adventure begins after the player and their crew receive a distress signal from a derelict ship. What initially appears to be a straightforward rescue situation quickly evolves into a much more complicated conflict involving an abandoned settlement and the future of the Sub Rosa criminal organization.

Things become particularly unpleasant when the crew discovers a group of people suffering from a condition that causes their cells to undergo explosive death. As usual in the world of The Outer Worlds, the situation involves more than simply finding a cure or defeating an enemy. Obsidian has promised that the expansion will feature moral dilemmas and consequences that will influence what happens next. Decisions made during the expansion will also carry over into the narrative direction of the second DLC, expected in spring 2027.

Level cap 36, new perks and flaws

With Side Effects Guaranteed, character progression is receiving a substantial upgrade alongside the new story content. The level cap will increase from 30 to 36, giving players additional opportunities to develop their characters and experiment with different builds.

The expansion will introduce:

• 15+ new perks to expand character customization.

• Four new flaws that add further complications and trade-offs.

• Six additional character levels to unlock new progression possibilities.

These additions should give returning players more reasons to reconsider their existing builds, whether they are focused on combat, specialized abilities or unconventional approaches to encounters. The extra progression options should offer more flexibility.

There is also a particularly useful addition arriving alongside the DLC: a free update that introduces full character respec. Players will be able to redistribute their character's skills and perks at any time, making it easier to experiment with different builds without having to start a completely new playthrough.

New weapons, including the Immobilizer

Weapons are another major part of the expansion, which features five new weapons that players can add to their arsenal. The Immobilizer stands out as the most interesting one, as it's a weapon that manipulates gravity to suspend enemies in mid-air. Once a target is floating helplessly, players can switch to another weapon and take advantage of the situation. The Immobilizer also opens up some interesting combat combinations. Obsidian specifically highlights pairing it with grenades to create anti-gravity explosions or using Tactical Time Dilation to slow down time and land more accurate shots.

Another notable addition is the 1/6 Resolver, which delivers an especially powerful shot with every sixth bullet fired. The remaining additions include a weapon that deals additional damage to creatures, a special Tossball Stick, and a new plasma weapon. Together, these weapons should provide more opportunities to experiment with combat strategies, particularly for players who enjoy combining different weapon effects and abilities.

How to start the DLC directly

Players won't necessarily need to finish the entire main campaign before experiencing Side Effects Guaranteed. Obsidian has confirmed that the expansion can be started directly from the main menu. When beginning a new game, players will find a dedicated option to jump straight into the DLC.Selecting this option loads a pre-made level 27 character. Players can then assign skill points and perks before entering the new adventure.

For existing characters, the expansion's events are designed to take place shortly before the main game's point of no return. This gives players an opportunity to experience the additional content without disrupting the overall campaign structure. 

The accompanying free update also introduces another useful feature: custom game options will allow players to adjust the number of skill points earned per level. This provides even more control over character progression. In addition, the update brings a new Sub Rosa radio station featuring 20 new songs, giving players some fresh music while exploring the expanded world.

Is Side Effects Guaranteed worth looking forward to?

Side Effects Guaranteed is a meaningful first expansion for The Outer Worlds 2. Obsidian is combining a new narrative location with expanded progression, fresh weapons and improvements to character customization. The ability to start the DLC directly with a level 27 character is particularly welcome for newcomers or players who want to experience the expansion without replaying the main campaign. Meanwhile, the free respec update benefits everyone, regardless of whether they purchase the expansion. There is also the promise of a continuing story. With the second part planned for spring 2027, the decisions players make in Elysium Valley could prove important beyond this first release.

For players ready to return to Obsidian's unpredictable sci-fi universe, Elysium Valley is the next destination. Use our comparator to find the best deals for The Outer Worlds 2 and get ready to discover an expanded experience with the release of Side Effects Guaranteed on December 2.