Radii
by Starkye
Radii turns the area around spawn into a set of concentric rings, where mobs grow tougher the farther a player moves from the origin.
What it does
Radii splits the world into rings centred on a chosen point, with the origin set to 0 0 by default. Each ring has a size measured in blocks, and the gap between neighbouring rings is also configurable, so a server can pick how quickly the difficulty climbs. Mobs gain health and damage based on the ring they stand in, with a percentage added per level, and a ring zombie at ring nine might carry 100 health.
A world barrier stops players from crossing beyond 2400 blocks in the dimension, which keeps the challenge bounded. The design suits server owners who want players to settle near spawn while still having something to work toward, and players who prefer small or limited worlds with a clear sense of progression.
The mod is server required and client optional: the server must run it, while players may leave it out. It is released under the MIT License, and files are published for 1.21.6 – 1.21.11 on Fabric, Forge, NeoForge and Quilt, plus a data pack for server platforms. Radii is not open source.
Key features
Concentric difficulty rings
Mobs level up according to their distance from the origin, with each ring adding health and damage.
Adjustable ring size
The width of each ring and the spacing between rings are set in blocks, defaulting to 256 blocks between rings.
Configurable stat scaling
The percentage of total stats added per level is adjustable, with a default of 50 percent.
Movement barrier
A world barrier stops players at 2400 blocks, so exploration has a defined outer edge.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Spawn-centred survival
Servers can keep players near spawn while still giving the outer rings a challenge to aim for.
Limited-world challenge
Players who prefer a smaller world with a clear progression curve can run the rings on a single-player world.
Who it’s for: Server owners who want a difficulty gradient around spawn, and players who enjoy exploring a bounded world where the danger rises with distance from the origin.
Questions
Does Radii need to be installed on the server?
Which loaders does Radii support?
Can the ring centre be moved away from spawn?
More from Starkye
Official listing
- Modrinth page
- modrinth.com/mod/radii
- Owner
- Starkye
- Published
- 2025-12-24
- Updated on Modrinth
- 2026-01-07
- Facts verified
- 2026-10-15