By default (as of 17th January 2026) Hytale doesn't allow us to edit instances (it is hardcoded)

This mod allow you to :

Duplicate existing instances in your own Pack
Create totally new Instances
Save your changes on updated Instances

Command list :

/customInstances <InstanceName>

Create a totally new Instance (chose the default worldgen by default but it can be changed in the files)

Can be added into the Pack you chose by using "--pack <packname>"

Can erase already existing instances by using "--force true"

/custominstancescopy <InstanceNameToCopy> <CreatedInstanceName>

Copy an existing Instance from and to a Pack you decide

Can be selected from any Pack by using "--fromPack <packname>"

Can be copied to any Pack by using "--toPack <packname>"

Can erase already existing instances by using "--force true"

/custominstancessave

Instances normally don't save the changes you made to them but with this command you can add blocks to them and then save all changes

Use /custominstancessave --toPack <packname> --name <instancename> --force true

To make this command work, you have to join an existing instance that is NOT in the hytale pack by using the vanilla "/instances" command. Once you joined your instance and made changes, use it to save those changes.

Example Workflow :

Be sure you have a Pack created in the asset editor
Duplicate the existing "Dungeon_Outlander" Instance with command "/custominstancescopy Dungeon_Outlander <MyNewTestInstance> --toPack=<YourCompletePackName>"
This new instance should be seen using the "/instances" command
Join this Instance by selecting it and clicking spawn
Make any changes you desire
Use the command "/custominstancessave --toPack=<YourCompletePackName> --name=<MyNewTestInstance> --force=true"
Use "/instances exit" to leave this instance
Join this Instance by selecting it and clicking spawn after using "/instances" command
You should see the changes you did

Custom Instances