Skyblock Portals
by DarkestByte
Skyblock Portals lets players build portals that lead to skyblock versions of the Overworld and the Nether, and it is a Fabric world generation mod for 1.21.11.
What it does
Skyblock Portals adds portals that open into skyblock versions of the Overworld and the Nether. Activating a portal requires an activation item, and building one uses vanilla items that take some progression to gather. The skyblock dimensions mirror the originals one to one, and the mod is meant for progression-gated islands on servers that want to avoid custom content.
The Overworld Skyblock and Nether Skyblock dimensions are reached by crafting portals from items such as dark prismarine, crying obsidian, a recovery compass and a nether star, and players must engage with an ocean monument before they can obtain the required pieces. The mod uses CustomPortalApi by kyrptonaught for its portal logic. It requires Fabric API and is published for Fabric only, with the latest file, 1.0.0, released on 2026-01-12.
Skyblock Portals runs on client and server, so the server and every player need it, because the custom colored portal panels, particles and networking depend on both sides. It is released under the MIT License and is not open source.
Key features
Overworld Skyblock
A portal leads to an island-based Overworld, which gives players a compact area to build without digging a large perimeter.
Nether Skyblock
A second portal leads to an island-based Nether, so the same progression path covers both dimensions.
Progression-gated items
Dark prismarine, crying obsidian, a recovery compass and a nether star are needed, so reaching the skyblock dimensions takes effort.
Vanilla-friendly mechanics
Portals work with vanilla items and blocks, with custom items kept to the activation item.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Survival progression
Players working through the game reach the skyblock dimensions only after gathering the required items.
Mob farm spawn proofing
Small skyblock islands need little spawn proofing, which makes a mob farm quicker to build.
Who it’s for: Server owners running progression-gated SMP worlds, and players who want skyblock islands without digging out a large area.
How it compares
Custom End Portals is a Fabric mod for 1.21.1 – 1.21.3 that is open source under the MIT License and runs on client and server. Dimensions 1:1 is a Fabric mod for 1.21 – 1.21.8, open source under the MIT License, and runs on the server only, so players need nothing installed. Skyblock Portals targets 1.21.11 only and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Skyblock Portals | Fabric | 1.21.11 | Client and server | 2026-01-12 |
| Custom End Portals | Fabric | 1.21.1 – 1.21.3 | Client and server | 2024-10-28 |
| Dimensions 1:1 | Fabric | 1.21 – 1.21.8 | Server-side only | 2025-09-07 |
Questions
Does Skyblock Portals need Fabric API?
Does Skyblock Portals have to be installed on both sides?
Which Minecraft version does Skyblock Portals support?
In the catalog
Skyblock Portals is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Master the Overworld and Nether to unlock their skyblock counterparts! This Fabric mod adds portals that transport players to skyblock versions of the overworld and nether dimensions. The dimensions are a 1:1 mirror of the originals.
Official listing
- Modrinth page
- modrinth.com/mod/skyblock-portals
- Owner
- DarkestByte
- Published
- 2026-01-12
- Updated on Modrinth
- 2026-01-12
- Facts verified
- 2026-10-15