Twenty-three reported mutations, what each one changes, which of them say you were born with the trait, and how to apply one on purpose. Checked 2026-09-23.
The community wiki lists twenty-three mutations, and fourteen of them say the avatar was born with the trait or was born in a named region. The two documented ways to apply one on purpose are a Random Mutation Vial at 10 Cores and a Height Vial at 4 Cores.
Evidence boundary: Every mutation name and every number on this page comes from one player-maintained source: the Fandom Harp Isles wiki Mutations page, read on 2026-09-23 (that page was last edited 2026-09-19). The only two facts here that a second source also shows are the price of a Random Mutation Vial and the fact that a vial is how you apply one. This site has never equipped a mutation and measured it, so no number below is an observed value, and the game was updated on 2026-09-20, after the community page was written.
Use the table below to recognise a row you already have, not as a price list. Only two of the numbers here — the Random Mutation Vial and the Height Vial — are corroborated by anything other than the community page.
Names, descriptions and numbers are from the community wiki page read 2026-09-23. The Where it comes from column repeats what that page states, and says Not stated where it states nothing.
| Mutation | Reported effect | Where it comes from |
|---|---|---|
| MelanismThe community description says the avatar was born with it and is often left behind by its own kind. | +5 weight, −2 sprint speed | Born with |
| AlbinismSame born-with framing as Melanism, with different numbers. | +5 damage, −2 weight | Born with |
| Mossy | +8 weight, −5 sprint speed | Born in the marshland region |
| FrostbittenThe only row whose number is written as a delay rather than a stat. | −5 stamina, +15 ping in seconds | Born in a snowy region |
| Waterlogged | +3 armor, +10 swim speed | Born in a swamp region |
| ThornstrakedSpelled Thornstraked on the community table. | +2 sprint speed, +30 drink consumption rate | Born in the Bloodshroum region |
| ObsidianThis is a mutation name, not the obsidian material. The two are unrelated. | +5 armor, −2 sprint speed | Born in a volcanic region |
| Sandy | −5 damage, +5 sprint speed | Born in a sandy region |
| Webbed feet | +15 swimming speed | Not stated |
| Windwalker | +5 health, +3 sprint speed | Born in a plains region |
| Daffodil | −3 weight, +4 max flight speed | Born in a plateau region |
| Falcons touchThe community table leaves the description column empty. | +35 max dive speed | Not stated |
| Forested | −5 walk turn speed, −5 sprint turn speed | Born in a woodlands region |
| Sunset | +20 jump power | Born in a colder climate |
| Venomous Glands | +1 venom ailment on 1st attack | Not stated |
| Lacerating bite | +7 damage | Not stated |
| HeightThe community vial page separately says a Height Vial makes the creature 7% taller. | +3 damage, +3 health, −2 walk speed, −4 sprint speed | Applied by a Height Vial |
| EverglowThe only row with no numbers at all. | No stat line — the community table writes only Shiny | Not stated |
| SeastriderThe chip page ties this mutation to Swimchip, which our recorded shop screen showed at 10 Cores. | +40 swim speed, +40 max oxygen | Granted by Swimchip |
| SpeedyThe flight figure is written without a number in the community table. | −5 weight, +5 walk speed, +5 sprint speed, and an unnamed max flight speed gain | Not stated |
| Razor Fangs | +1 bleed attack at 1st attack | Not stated |
| ErodedNumerically identical to Mossy in the same table. | +8 weight, −5 sprint speed | Born in a rocky region |
| OvergrownThe community table leaves the description column empty. | +15 max oxygen, +8 range | Not stated |
Read the Where it comes from column before the effect column. Fourteen of the twenty-three rows say the avatar was born in a named region or born with the trait, which makes them a character you rolled rather than something you buy. The community vial page documents a shop route for two of them instead: a Random Mutation Vial applies a random mutation for 10 Cores, and a Height Vial applies Height for 4 Cores.
This is the part players actually search for, and it is also where the two sources are weakest. Both routes below are written with the source next to them.
Fourteen rows on the community list say the avatar was born with the trait or was born in a named region — marshland, snowy, swamp, Bloodshroum, volcanic, sandy, plains, plateau, woodlands, rocky, or a colder climate. That framing makes those rows something you roll rather than something you buy, and it is the reason a mutation is not the same purchase decision as a chip.
The community vial page lists a Random Mutation Vial that applies a random mutation to your creature for 10 Cores, and a Height Vial that applies the Height mutation for 4 Cores. Our own recording of the Cores shop from 2026-09-07 shows a row named Random Mutation at 10 Cores, which is the only corroboration on this page. The same recording shows the nest upgrade panel carrying a Mutation stat of its own.
Cores are the currency behind both vials. Where Cores come from, and what else they buy, is on the items and rewards reference. The chip that grants a mutation rather than a stat line is on the chips page, and the species a mutation sits on top of is on the creature reference.
Written down instead of smoothed over. Applying a vial once and reading your own stat panel settles all three.
The community chip page describes Swimchip as doubling oxygen; the community mutation page lists Seastrider as +40 swim speed and +40 max oxygen; our own chips page repeated the chip page as +40% speed in water. Nothing we hold measured it. Treat the number as unverified and check your own stat panel after applying anything.
The mutation table lists Height as +3 damage, +3 health, −2 walk speed and −4 sprint speed. The vial page says a Height Vial makes the creature 7% taller. Those are two different claims about one mutation, and the 7% figure never appears in the stat row.
Mossy (born in the marshland region) and Eroded (born in a rocky region) both read +8 weight and −5 sprint speed. Either the region wording is cosmetic or one of the two rows was copied without being edited. The community table does not say which.
Footage this page is checked against: Ultimate Guide! (Late Kate, recorded 2026-09-07) — the Cores shop row named Random Mutation, and the nest upgrade stats · Avatar Shards, Deathcaps, NPCS, Smelting, Forging (The Hissy Missy, recorded 2026-08-30). Community pages read 2026-09-23: https://harp-isles.fandom.com/wiki/Mutations and https://harp-isles.fandom.com/wiki/Vials Spotted a mutation that is missing, or rolled one whose numbers disagree with the table? Say so on the contact page and the row gets corrected rather than quietly dropped.
They are stat modifiers attached to a living avatar. The community wiki lists twenty-three of them, and most change weight, speed, armor, health, damage, oxygen or flight and dive speed. They are not the same thing as a subspecies or an Apex form, which the community pages treat as a named identity rather than a modifier.
Two routes are documented, and only one of them is a purchase. Most rows on the community list say the avatar was born with the trait or born in a named region, so they are rolled rather than bought. The other route is a vial: the community vial page says a Random Mutation Vial applies a random mutation to your creature for 10 Cores, and a Height Vial applies the Height mutation for 4 Cores.
10 Cores. That is the one number on this page with two independent readings: the community vial page states 10 Cores, and our own recording of the Cores shop from 2026-09-07 shows a row named Random Mutation at 10 Cores. The same recording shows the nest upgrade panel carrying a Mutation stat of its own, so vials are not the only place the word appears.
No. The community pages use subspecies and Apex names as an identity you unlock or apply, and mutations as a modifier sitting on top of whatever species you already have. If you are deciding between the two, the species side is on the creature reference and the modifier side is this page.
Unknown. Nothing we read shows a mutation being taken off an avatar, replaced by another, or surviving a death, and nothing shows what a second Random Mutation Vial does to an avatar that already has one.
No. They share a word and nothing else. Obsidian the mutation is a birth-region stat row (+5 armor, −2 sprint speed). Obsidian the material is the gathered resource that drops from cube-shaped black boulders in the volcano region and feeds the smelter recipes on the items and rewards page.
