How to Enable or Disable Mutations on Your The Isle Evrima Server

Last updated: August 17, 2026

This guide shows you how to configure the mutations system on your The Isle Evrima server. Mutations let dinosaurs develop random genetic traits as they grow — affecting stats like health, stamina, weight, and appearance. The system is enabled by default, but you can toggle it off for vanilla servers or reset it for events.

What Mutations Do

Mutations are random genetic variations that activate at specific growth stages:

Trait Type	Examples
Stat boosts	+5% health, +10% stamina, +15% bite force
Stat penalties	−5% turn speed, −10% nutrition efficiency
Appearance	Colour shifts, body markings, scarring
Diet	Modified diet preferences

Each playable species has its own mutation pool. Players can see their dinosaur's mutations in the character info screen.

Enable or Disable Mutations

Stop the server — Log in to the NolimitHost Game Panel, select your server, and stop it first.
Open Game.ini — In the left sidebar, click File Manager and navigate to TheIsle/Saved/Config/LinuxServer/Game.ini.
Set bEnableMutations — Under [/Script/TheIsle.TIGameSession]:
```
[/Script/TheIsle.TIGameSession]
bEnableMutations=true
```
To disable mutations entirely, set it to false:
```
bEnableMutations=false
```
Save and start the server from the Console. Mutations take effect for any new growth on the next server start.

When to Disable Mutations

Most servers leave mutations enabled — they add gameplay variety and are a core part of the Evrima experience. Reasons to disable:

Scenario	Why
Competitive PvP servers	Removes randomness so all dinosaurs of the same species are identical.
Tournament events	Levels the playing field for organised matches.
Hardcore vanilla servers	Some communities prefer the pre-mutation gameplay.
Testing / development	Easier to test mechanics without random stat variation.

Existing Mutations Are Not Removed

Disabling mutations does not remove existing mutations from already-grown dinosaurs — they keep whatever traits they already have. Mutations only stop being rolled at growth milestones going forward. To remove all mutations, you'd need to wipe player progress (see the Reset Server guide).

Related Setting: Diets

The diet system (bEnableDiets) is similar — it adds nutritional variety to dinosaurs. They're independent toggles:

bEnableMutations=true
bEnableDiets=true

You can run with mutations on but diets off, or any combination.

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