This is Immersive Portals for (Neo)Forge. Here's the Fabric version. 

There's an Important Notes and FAQ section at the bottom of this description. Please take your time and read it.

See through portals and go through them seamlessly without a loading screen.

Other Features:

• Enhanced End Portals

• Mirrors

• Commands for Creating Custom Portals

• Datapack Based Custom Portal Generation

• World Wrapping

• Dimension Stack

• See the Wiki for more information.

Dependencies:

The 1.14 and 1.15 version of this mod depend on MixinBootstrap.

All versions after 1.19 of this mod depend on Cloth Config API.

Contact:

Report Issues

Discord Server

Important Notes and FAQ:

• It's NOT recommended to use the versions for MC 1.16.x because it's heavily outdated and incompatible with Forge's dynamic dimension feature.
• ALWAYS BACKUP YOUR EXISTING WORLD(S) WHEN ADDING A NEW MOD.
• Q: I ran into an issue with this mod, what should I do?
  A: See the contact section above and open an issue on GitHub and/or leave a message in the #help-forge-version channel in our Discord Server.
• Q: [MC Version] when?
  A: When it's ready! Please stop asking, I'm aware when a new MC version is released.
• Q: What MC versions are supported?
  A: See the support matrix below:

Note: All versions that are not mentioned in the matrix that are older than the latest version mentioned in the support matrix are explicitly not planned. All versions newer then the latest version mentioned are under consideration. Please stop asking for them. All versions marked with 🦊 are NeoForge versions.