Quick answer: Deviation Fusion lets you combine two Deviations at a Fusion Pod to make a new one that randomly inherits its type and traits from both parents. The two parents are not consumed, but each one can only be fused once. Anything you add as a fusion material (another Deviation, an animal or a piece of furniture) is consumed and shifts the odds or adds a new trait. A fusion takes 5 minutes since Version 2.3.6, and it works in every scenario except RaidZone. This guide was checked against the official Once Human update notes on November 10, 2026 (current build: Version 3.1.2, released November 4 PT).
Key takeaways
- Two parents, one result. The result's type and traits are rolled from both parents. The Fusion Pod shows you the odds before you start.
- Parents survive, materials don't. Each parent can be fused only once. Every fusion material is used up.
- Stack the trait you want. Choose parents that both carry the target trait, then add materials that carry it too.
- Fusion is 5 minutes now. Version 2.3.6 (April 8, 2026) cut the timer.
- Isles of Abyss added seven fusion-ready Morphed Deviations in Version 3.1.1 (October 21, 2026).
What is Deviation Fusion in Once Human?
Deviation Fusion is the system that breeds new Deviations out of the ones you already have in containment. It went live on September 24, 2025 (PT) with Version 2.1.4, launched alongside the Early Access of the Deviation: Survive, Capture, Preserve scenario. It wasn't locked to that scenario, though. The official 2.1.4 notes say: "Deviation fusion will be available in all non-RaidZone scenarios." (Version 2.1.4 Update Announcement)
The studio's own description is the best one-line summary of what the system does:
"You can fuse two Deviations. The resulting Deviation will randomly inherit its type and trait from the source Deviations. The source Deviations are not consumed during fusion, but each source Deviation can only be fused once." (Deviation: Survive, Capture, Preserve Early Access Preview, September 19, 2025)
Players took to it fast. In its October 2025 launch post, the studio reported that during the scenario's Early Access, players "fused Deviations 724,610 times". More than 240,000 Metas joined that test (Scenario Official Launch and Optimizations).
If you came in with the PS5 and Xbox launch on August 25, 2026, Fusion is already part of the game you're playing: console, PC and mobile players share the same cross-play servers, and the official notes list no console-specific fusion restriction. Our console beginner guide covers the first hours before you get here.
How do you unlock and build the Fusion Pod?
You fuse at a Fusion Pod, a facility you place in your territory. The official notes don't spell out the unlock path, so this part comes from community sources, and it changed when Memetics became Tech in 2026:
- Tech tree. The community wiki lists the Fusion Pod as a Tech in the Build category. You spend Tech Points to unlock it. Our Tech tree guide explains how Tech Points work now.
- Reverse engineering. The wiki also describes finding a built Fusion Pod in a settlement, picking it up with a Recycling Tool and processing it at your base. Version 2.3.6 made reverse engineering of "cultural artifacts" a main unlock route, so check this if the Tech isn't showing for you.
- Placement. Community guides report one Fusion Pod per territory, and that it can't be placed in Eternaland. Build it inside your own territory, not a friend's.
The exact unlock can differ by scenario. If you can't find the Fusion Pod, open the Tech screen and search for it before you farm materials.
How does Deviation Fusion work, step by step?
- Interact with the Fusion Pod and pick your two parent Deviations from containment.
- Read the preview panel. It shows the possible result types and the chance of each parent trait passing down. A September 2025 r/OnceHumanOfficial findings thread described it: "On the left side you can see the probability of it inheriting the skills of each parent."
- Add fusion materials in the middle slot if you want. They can be Deviations, animals or furniture. They change the odds or add a new trait.
- Start the fusion. It takes 5 minutes since Version 2.3.6 ("Deviation fusion time has been adjusted to 5 minutes," Version 2.3.6 Update Announcement, April 8, 2026). Older guides that say 10 minutes are out of date.
- Collect the new Deviation from the result screen.
Two rules matter most here. Parents are kept, but each parent can only be used for one fusion, so picking a parent is a one-time choice. Materials are destroyed. The official preview warns: "Fusion materials are consumed during fusion. Please proceed with caution."
How do traits pass down in a fusion?
The result rolls its type (what it is) and its traits (what it does) from the two parents. Here is what each piece of the setup controls:
| Input | Consumed? | What it does |
|---|---|---|
| Parent A | No, but can't be fused again | Gives its type and traits to the roll |
| Parent B | No, but can't be fused again | Gives its type and traits to the roll |
| Fusion material: Deviation | Yes | Pushes the odds toward its traits |
| Fusion material: animal or furniture | Yes | Can add a new trait to the result |
| Skill Mutagen | Yes | Steers the skill result; the Pod describes each Mutagen's effect (added October 2025) |
The furniture part is real, and it's as silly as it sounds. The official 2.1.4 fusion screenshot at the top of this guide shows a dragon Deviation that came out with a Modern Toilet trait. The studio pitched the system as a way to "create unique entities with interesting and amusing traits."
There's one exception. In Deviation: Survive, Capture, Preserve, Version 2.2.0 replaced Lunar Oracle drops with Lunar Oracle Mutagens and added Starfall Inversion Mutagens. You fuse with these to give a Deviation those attributes, but per the 2.2.0 notes the Mutagens can't leave the scenario, and "The Lunar Oracle attribute and the Starfall Inversion attribute cannot be transferred through fusion."
What about exact percentages? NetEase hasn't published a fusion probability table. The Fusion Pod shows the odds for your exact setup before you confirm, and that in-game number is the only one to trust. Treat any "X% guaranteed" figure from a third-party site as a community estimate.
How do you get the trait you want?
This is the method players use. It's a strategy, not a published rate:
- Pick parents that both carry the target trait. Two parents with the trait beat one parent and a lucky roll. The preview panel shows the chance go up right away.
- Add materials that carry the same trait. Fusion materials push the roll toward their traits. If you have spare Deviations or animals with the trait, they belong in the material slot.
- Chain your results. Each parent can only be fused once, but the new Deviation is a fresh parent. A September 2026 community guide on r/OnceHumanOfficial puts it this way: "Once you have the first parent with the the traits you want, fuse it again." Breed toward the trait over two or three generations instead of hoping for one perfect roll.
- Remove competing traits. The more different traits the parents and materials bring, the more ways the roll can go wrong. Feed in materials that share the trait, not random ones.
- Never use a Deviation you care about as a material. Materials are destroyed. Keep your best combat and production Deviations as parents only.
For which Deviations are worth breeding toward in the first place, see our best Deviations tier list. For keeping them working once they're placed, see the Deviations and Cradle guide.
Which Isles of Abyss Morphed Deviations can you fuse?
Version 3.1.1 (October 21, 2026) launched the Isles of Abyss scenario with seven new Morphed Deviations. The patch notes say: "All the above Morphed Deviations support Deviation Fusion." (Version 3.1.1 Update Announcement) Here's where each one comes from:
| Morphed Deviation | Where to get it |
|---|---|
| Shattered Maiden - Sailor Suit | Calamity Tower |
| Director Fox - Vacation | Drifting Greenhouse |
| Gingerbread House - Oceanic Cottage | Calamity Tower |
| Whalepup - Don't Get Wet | Voyagers |
| Space Turner - Water Cube | Sea Calamity Zone |
| Snow Globe - Sunken Treasure | Calamity Nest |
| Employee No. H37 - Submarine Attitude | Voyagers |
Each is a chance drop from that activity. The studio hasn't published drop rates, so plan on several runs. Two of them come from the Calamity Tower, which makes our Calamity Tower guide the most efficient place to start. The same patch added Duet, a weather-changing Deviation from The Sunken Lord, and Chaos Rebecca from the Chaos Tower. The 3.1.1 notes don't say whether those two can be fused, so check the Fusion Pod before you plan around them.
What changed in Deviation Fusion since it launched?
| Date (PT) | Version / post | Fusion change |
|---|---|---|
| Sept 24, 2025 | 2.1.4 | Deviation Fusion debuts in all non-RaidZone scenarios |
| Oct 29, 2025 | Scenario launch (announced Oct 24) | Fusion items no longer add Load; Skill Mutagen descriptions added; Activity Rating no longer drops after fusion; new Morphed Deviations and functional-attribute fusion effects |
| Oct 29, 2025 | 2.2.0 | Lunar Oracle and Starfall Inversion Mutagens added in Deviation: Survive, Capture, Preserve |
| Mar 25, 2026 | 2.3.5 | Fixed fusion attribute text on mobile |
| Apr 8, 2026 | 2.3.6 | Fusion time cut to 5 minutes |
| Jun 10, 2026 | Meta Hotline vol.3 | Attribute filter for fusion confirmed in development, "expected release in the second half of the year" |
| Oct 21, 2026 | 3.1.1 | Seven Isles of Abyss Morphed Deviations, all fusion-compatible |
That attribute filter is the most requested quality-of-life fix for fusion. In Meta Hotline vol.3, the studio said picking the right Deviation "requires repeatedly browsing and comparing through multiple pages of the Deviation list." We couldn't confirm a release in the patch notes we checked through 3.1.2. Look for a filter option on your Fusion Pod screen. If it isn't there, sort your containment by hand before a long fusion session.
Which scenario is best for Deviation Fusion?
Fusion works everywhere except RaidZone, but scenarios aren't equal for it:
- Deviation: Survive, Capture, Preserve is built around Deviations. They roam the map, you capture them with special tools, and the scenario-only Mutagens live here. It is also a standalone scenario: per the official launch post, "your stats on other scenarios don't apply here."
- Isles of Abyss is where the seven new fusion-ready Morphed Deviations drop.
- Any PvE scenario works for casual fusion with what you already own.
If you're still choosing where to settle, our best scenario guide compares them for solo players and groups.
Common Deviation Fusion mistakes
- Using a favorite Deviation as a material. It's gone after the fusion. Only use duplicates and spares as materials.
- Wasting a parent on a test fusion. Each Deviation can only be a parent once. Test with spares first.
- Trusting 2025 guides on the timer. It has been 5 minutes since April 2026, not 10.
- Looking for Memetics. The Fusion Pod is under Tech now. Memetics was renamed in Version 2.3.1.
- Planning around unpublished odds. Only the numbers in your own Fusion Pod preview are real.
FAQ
How do you fuse Deviations in Once Human? Build a Fusion Pod in your territory, pick two parent Deviations, optionally add fusion materials, then start the fusion. It takes 5 minutes since Version 2.3.6 (April 8, 2026), and the result rolls its type and traits from both parents.
Does Deviation Fusion destroy my Deviations? The two parents are kept, but each parent can only be fused once. Any fusion materials you add, including Deviations, animals and furniture, are consumed.
Can you fuse Deviations in RaidZone? No. The official 2.1.4 notes say Deviation fusion is available in all non-RaidZone scenarios.
How long does Deviation Fusion take? Five minutes. Version 2.3.6 on April 8, 2026 set the fusion time to 5 minutes. Guides that say 10 minutes describe the older timer.
What are the Deviation Fusion odds? NetEase hasn't published a fusion probability table. The Fusion Pod shows the inheritance odds for your exact parents and materials before you confirm. Use that number and ignore fixed percentages from third-party sites.
Can I fuse the new Isles of Abyss Morphed Deviations? Yes. Version 3.1.1 says all seven new Morphed Deviations, including Whalepup - Don't Get Wet and Snow Globe - Sunken Treasure, support Deviation Fusion.
Does Deviation Fusion work on PS5 and Xbox? Yes. Fusion has been part of the game since 2025, console players share the same cross-play servers as PC and mobile, and the official notes list no console-specific fusion restriction. Button prompts differ by platform, so follow the on-screen prompts at the Fusion Pod.
More Once Human guides
Building your Deviation roster? These guides cover the rest.
