Once Human Isles of Abyss Deviations: Duet, 8 Morphed Deviations & What to Bring

Short answer: Isles of Abyss adds one brand-new Deviation, Duet, which can drop from The Sunken Lord and changes the weather inside your territory. It also adds 8 Morphed Deviations, each tied to an activity: Calamity Tower, Drifting Greenhouse, Voyagers, Sea Calamity Zone, Calamity Nest or Chaos Tower. Abyssal Iron Guard, Drowning Light Apostle and Abyssal Sea Kins are new enemies, not Deviations you can catch. For the trip in, creators bring combat and territory Deviations such as H37 for gathering.

What’s new, in one minute

Isles of Abyss adds two kinds of Deviation:

• One brand-new Deviation, Duet, from The Sunken Lord.
• Eight Morphed Deviations. These are themed variants of Deviations that already exist, and each one is tied to a scenario activity.

The patch notes also add three new enemies with Deviation-style names. You fight them; you don’t collect them. They have their own section further down.

This page lists every Deviation, where it comes from and what to bring with you. For full stats on a single Deviation, use a database site. For the activities named below, see the Calamity Tower and Calamity Nest and The Sunken Lord guides.

Every new Deviation and where to get it

Screenshot: Azzel83, “Once Human ISLES OF ABYSS - HUGE Update!” on YouTube, at 5:35

src: patch notes (21 Oct 2026), New Deviations / Morphed Deviations · “what it’s for” for Morphed variants is not listed in the patch notes

The patch notes say you get these by taking part in the activity, and that each run gives a chance, not a guaranteed drop. Drop rates haven’t been published yet. All eight Morphed Deviations support Deviation Fusion.

Phase II activities (Drifting Greenhouse, Sea Calamity Zone, The Sunken Lord) only open once your server reaches Phase II. Check the phase dates on the Isles of Abyss hub. Voyagers sail random routes, and you can sink or board them. The ship cannons guide covers which guns to use against them.

Doomeris singles out the Snow Globe, Space Turner, Water Cube and H37 variants because they have a small chance of producing special materials.

src: Doomeris zIDlwmX7CPg @24:06

Duet: the new Deviation from The Sunken Lord

Screenshot: Azzel83, “Once Human ISLES OF ABYSS - HUGE Update!” on YouTube, at 4:55

• What it does: Duet changes the weather effects inside your territory in real time. Players inside the territory and the facilities placed there are both affected.
• How to get it: challenge The Sunken Lord for a chance at it. The dungeon only opens after server purification reaches 100%. How to get there: The Sunken Lord guide.
• Still to be announced: which weather it can switch to, how this works with the Haywire weather of each sea (Haywire Zones), and the drop rate. We’ll add these once the developer confirms.

src: patch notes (21 Oct 2026), New Deviation: Duet · momsbisburi ZHiW-FU_tCU @08:22

Other ways to pick up Deviations at sea

• Trawl nets. Put trawl nets on your ship. While you sail they collect fish, Deviations and scrap with no extra work. One creator says you can place up to four.
• Mysterious Morphed Deviation (limited event, 21 Oct – 30 Dec PT). The patch notes say it can be fished up at sea, or found in its boss form in the wild and tamed after you beat it. Its name isn’t given.
• Ocean Expansion: Isles of Abyss Bonus Pack (free on Steam, one per account). It lets you choose one of seven exclusive Isles of Abyss Morphed Deviations. Details: servers and starter items.
• Isles of Abyss Deviation Selection Gift Box. This box lets you pick one Deviation. On 3.1.1 it gave some players the wrong item; see the fix below.

src: Anestic tir1Sw4HYZI @02:00 · Gotcha Beast KJvFq__cWp8 @03:41 · patch notes (events) · Steam Bonus Pack page · 3.1.1 Bug Fixes

Screenshot: Azzel83, “Once Human ISLES OF ABYSS - HUGE Update!” on YouTube, at 5:15

Which old Deviations to bring into Isles of Abyss

You start at max level, but your Tech progress decides what gear you can use, so a strong old weapon may stay locked for days. Deviations are a cheaper way to start strong. Creators recommend these:

src: Heartcarver TXO2KfhKwro @03:41, @05:22 · VitKryk UHscvO_e1hc @00:00 · Grizl o5-Cq9fuLF0 @02:40

Heartcarver also says to leave Tech-locked weapons and solar panels behind; he says solar panels can’t be moved once you bring them. The current basic Battle Pass gives Blue Butterfly - Butterfly’s Emissary at Lv30, though that battle pass isn’t ocean-themed. VitKryk doesn’t say which butterfly variant he uses.

Moving Deviations over from Manibus

People on Steam and Facebook keep asking whether they can bring a Deviation, including a 5/5 one, from Manibus or another scenario. Here is what is known:

• Official: an existing character can join after its current scenario reaches the Rest Period. Level and supplies are reset. Shared data such as cosmetics, Blueprint Level and Mod Level stay. The notice doesn’t mention Deviations by name.
• Creator method: Heartcarver uses Eternaland as a go-between. Build a foundation and any storage box there, put in what you want to keep, then take it out with the character that enters Isles of Abyss. He moves his combat and territory Deviations this way.
• Still to be announced: whether a Deviation keeps its star rating and level after the move.

For the full list of what carries over and what resets, see Isles of Abyss servers.

src: Server Opening Schedule (21 Oct 2026) · Heartcarver TXO2KfhKwro @02:22, @03:41 · Steam “How to inherit deviations ?”

New enemies with Deviation names (you can’t catch these)

These three show up in searches for “new Deviants”, but the patch notes list them as enemies:

src: patch notes (21 Oct 2026), new enemies · momsbisburi ZHiW-FU_tCU @08:42

In Falling Ember, big Skyfire meteors also spawn Deviant guards. These are enemies to clear before you mine, not Deviations to collect.

FAQ

What changed

• v3.1.1 · 2026-10-25Page created.