Catch Butterfly's Emissary and Festering Gel first. One marks enemy weak spots so everything you shoot takes 25% to 35% extra damage there, the other drops a shelter that heals you 4.5% to 7.5% of your HP every second while you stand behind it. Together they cover the two ways fights go wrong. After that, The Digby Boy mines ore at your base without you, which removes the grind most players quit over.
Those three are the short version of a longer answer, because Deviants do three completely different jobs and collecting the wrong mix is the most common early mistake in the game. Here is the full board.
The nine worth catching, by job
Ranked within each job, with where it drops and the room conditions that keep it productive.
| Deviant | Job | What it actually does | Where it comes from |
|---|---|---|---|
| Butterfly's Emissary | Combat | Marks an enemy weak spot on hit; that spot takes 25% to 35% extra Weakspot DMG for 5s, by level | Eve of Evolution tutorial, GAIA Research Center Ruins, Securement Silo Alpha |
| Festering Gel | Combat | Builds a fixed shelter that blocks attacks and restores 4.5% to 7.5% HP and 2.25% to 3.75% Sanity per second to allies near it, by level | Ravenous Hunter in Monolith of Greed, or Treant at Gaia Cliff Monolith |
| Lonewolf's Whisper | Combat | Marks targets and raises the weapon damage they take; spawns clones on a kill | Shadow Hound at Monolith of Thirst |
| The Digby Boy | Territory | Mines ore on command from an Isolated Securement Unit, efficiency scaling with level | Deviation Expert task, or while mining Silver Ore |
| Logging Beaver | Territory | Fells trees and stockpiles wood on the same loop | Meyer's Market, Iron River, Broken Delta |
| Nutcracker | Territory | Patrols as a mobile turret and attacks intruders during purification waves | Forsaken Giant Mensdevoran at Forsaken Monolith |
| Artisan's Touch | Crafting | Unlocks Formula: All-Purpose Hand, which repairs your least durable crafted gear, one use per item | Elite Scorchers, commonly 8 to 10 kills before it drops |
| Space Turner | Crafting | Produces Spatial Keystones for Space Twisters, letting teammates teleport to you without Energy Links | Mystical Crates |
| Pup Buddy | Crafting | Produces Small Balloons for Featherweight Potions, roughly two hours of extra carry weight | Jonathan at Greywater Camp, and scattered zones |
Two traps in that table worth calling out, because both catch people who read a tier list and stop there.
Artisan's Touch is not a fighter. It is one of the rarest Deviations in the game and a lot of players chase it expecting a combat trophy. It stays at your base and its only output is a repair item, which still only works on gear you crafted yourself. Worth having, never worth prioritising over a healer.
Nutcracker defends your base, it does not ride along. It reads like a combat pick and it is not. If you want something that adds damage to the fights you are personally in, that is Lonewolf's Whisper.
Combat, Territory, Crafting: the split that decides your roster
| Job | Where it lives | What you get |
|---|---|---|
| Combat | On your person, in the field | Damage, healing, or control during fights you are in |
| Territory | Inside your base, in an Isolated Securement Unit | Passive mining, logging, farming, cooking, and defence |
| Crafting | Inside your base | Items and formulas produced over time |
The split that matters: Combat Deviants go out with you, Territory and Crafting Deviants stay home and work. Capturing three fighters and leaving an empty base is the classic opening mistake, because the passive workers are the ones generating value while you are offline or asleep.
Why your Deviants stop working
Deviants have moods. A Deviation's Sanity, shown as happiness, drives how well it performs, and an unhappy one slows down, produces less, or stops.
The lever is its environment. Every Deviation prefers specific room conditions, and matching them is a one-time setup that pays out forever:
- Butterfly's Emissary wants red light with flowers nearby.
- Festering Gel and Lonewolf's Whisper want red light and 5W of electricity, and Lonewolf's Whisper also likes the room cooled with fridges.
- The Digby Boy wants red light, 5W, and a radio playing music.
- Logging Beaver wants crops nearby, 5W, and a radio.
- Nutcracker wants green light, 5W, and toys.
- Space Turner wants blue light and toys; Pup Buddy wants green light, a radio, and toys.
- Artisan's Touch wants 5W and furnace heating.
Build one room per lighting colour rather than one room per Deviation and most of this solves itself.
Where they actually come from
Three sources, roughly in order of how much work they cost:
- Out in the world. Deviation sites and anomalies hold the common captures. This is where Butterfly's Emissary, Logging Beaver, and Pup Buddy come from.
- Boss and elite drops. The strongest combat Deviations are gated behind specific kills: Festering Gel from Ravenous Hunter, Lonewolf's Whisper from Shadow Hound, Nutcracker from the Forsaken Giant. Artisan's Touch is the outlier, a rare roll off elite Scorchers that often takes eight to ten attempts.
- Scenario progress and tasks. The Digby Boy unlocks from the Deviation Expert task, and more Deviations become capturable as a scenario advances.
Exact coordinates move with scenario and season, so treat a location as something to confirm in-game. The job each Deviation does is what holds across patches.
Catching your first three
If you are starting a fresh scenario, this order gets you furthest fastest:
- Butterfly's Emissary, because the tutorial hands it to you and it improves every weapon you will ever hold.
- Festering Gel, as soon as you can take Ravenous Hunter. A heal that stays on the field changes which fights you are allowed to lose.
- The Digby Boy, the moment you have an Isolated Securement Unit free. Ore is the bottleneck on every gear upgrade.
Add Logging Beaver fourth and your base is feeding itself. Everything after that is preference: Nutcracker if your server has raiders, Space Turner if you play with friends, Pup Buddy if you hate walking home overloaded.
For where each Deviation sits against the rest of the roster, our Once Human tier list ranks Deviations, bosses, and scenarios side by side, and each pick links through to its wiki entry.
What changes between seasons
Once Human resets on scenarios, so a roster is not permanent and new Deviations arrive with major updates. Our coverage of the Season 4 Riftwalker content and the Blueprint and Wish Machine rework tracks what moves patch to patch. New to the game entirely, start with the Once Human beginner's guide and come back once you have a base down.
If you only take one thing
A Deviant roster is not a collection, it is a staffing decision. One healer so fights stop ending in retreats, one miner so gear upgrades stop waiting on ore, one fighter to make your weapon hit harder than it should. Butterfly's Emissary, Festering Gel, and The Digby Boy cover all three, and every one of them is available before the midgame. Get those working and the rest of Once Human stops feeling like a second job.
