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ThinAir: ReLived

by kgbcupcake

ThinAir: ReLived is a NeoForge 1.21.1 fork of Thin Air that makes air quality matter underground and in other dimensions, with breathing gear to match.

NeoForgeClient and serverMIT LicenseOpen source1.21.1

What it does

Air is not always breathable in this version. Deep underground and in other dimensions the air can be unsafe, so a character going far down or high up needs equipment. The mod's air quality levels are shown as green, yellow, red and blue, and each level affects breathing differently and tells which equipment helps at that dimension and height.

The mod is a port of the original Thin Air, not a rewrite of its systems. Its features include respirators and air bladders, a Safety Lantern that shows nearby air quality as a color, a Signal Torch with configurable particles, and a Reinforced Air Bladder that uses netherite as an ingredient. Server owners control the settings from thinair-server.toml inside the world's serverconfig folder, and the server's copy takes precedence; an optional in-game screen is reachable from the Mods menu.

The mod requires Curios API, which provides the head slot used by the protective item. Cloth Config API and Create are optional. Thin Air: ReLived is open source under the MIT License and runs on client and server, so the server and every player need it. Files target 1.21.1 only, with 1.0.6 for 1.21.1 as the latest NeoForge file.

Key features

  1. Air quality levels

    Green, yellow, red and blue air each affect breathing differently, and show what equipment helps at a given height or dimension.

  2. Safety Lantern

    The lantern shows the color of nearby air quality and can be dyed, and it is scraped with an axe.

  3. Respirators and air bladders

    Respirators protect against choking air through a Curios head slot, and air bladders give portable air refills.

  4. Signal Torch

    Right-clicking the torch emits particles, and the particle settings can be configured.

Compatibility

Latest build for each game version and loader.

1.21.11.0.6
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Curios APIA flexible and expandable accessory/equipment API for users and developers.
Required

Optional 2

CreateAesthetic Technology that empowers the Player
Optional
Cloth Config APIConfiguration Library for Minecraft Mods
Optional

Use cases

Deep mining trips

Players who go too deep or too high use the air-quality colors and bladders to plan what gear to bring.

Server-side tuning

Server owners set the rules in thinair-server.toml, and players can edit them through the Mods menu.

Who it’s for: Players who want air quality to limit travel underground and in other dimensions, and server owners who want one shared set of breathing rules.

Questions

Does Thin Air: ReLived need Curios API?

Yes. Curios API is a required dependency, and the protective head item uses its head slot.

Does the mod have to be installed on the server?

Yes. Servers that run it need every player to install it too.

Where are the settings stored?

Settings live in thinair-server.toml under the world's serverconfig folder. An optional in-game config screen can edit them.

More from kgbcupcake

All projects
Immersive Lanterns (Unofficial-Fix)1.21.1Nourished1.21.1MariesLib1.21.1

What the author says

A faithful NeoForge port of fuzs's Thin Air. The air is not always breathable deep underground and in other dimensions. The original mod is archived on Modrinth (last release: Minecraft 1.20.4). This fork brings it forward to Minecraft 1.21.1 on NeoForge while staying close to the upstream design (not a ground-up…
kgbcupcake, on the Modrinth page

Official listing

Owner
kgbcupcake
Published
2026-06-08
Updated on Modrinth
2026-10-10
Facts verified
2026-10-15
Open on ModrinthCompare