ModsFinder

OneHP

by lakakoy

OneHP sets every player's maximum health to 1 HP, so a single hit is lethal, for hardcore play, challenges and speedruns.

FabricClient and serverAll rights reserved1.20.5 – 1.21.11

What it does

Player maximum health is fixed at one heart with this Fabric mod, and any damage that lands ends the run. A config option lets server owners turn the extreme difficulty on instantly. A server running it needs every connecting player to have it too. Files cover 1.20.5 – 1.21.11 across 14 release versions, with 1.2 for 1.21.11 as the latest file, and the code is under All rights reserved.

Key features

  1. One-HP maximum health

    Player maximum health is set to 1 HP, so any hit that deals damage is lethal.

  2. Instant difficulty config

    A simple config option switches the extreme difficulty on immediately for the server.

  3. Challenge and speedrun use

    The fixed health suits hardcore challenges, speedruns and custom maps built around death.

Compatibility

Latest build for each game version and loader.

1.21.x12 of 12 versions with builds
1.21.111.2-SNAPSHOT
1.21.101.2-SNAPSHOT
1.21.91.2-SNAPSHOT
1.21.81.2-SNAPSHOT
1.21.71.2-SNAPSHOT
1.21.61.2-SNAPSHOT
1.21.51.2-SNAPSHOT
1.21.41.2-SNAPSHOT
1.21.31.2-SNAPSHOT
1.21.21.2-SNAPSHOT
1.21.11.2-SNAPSHOT
1.211.2-SNAPSHOT
1.20.x2 of 2 versions with builds
ReleaseBetaAlphaNot available

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

How it compares

Full comparison

Easy Hardcore is a Fabric mod for 1.21.6 – 1.21.11 that is client-side only and not open source. Three Lives Fabric is server-side only, under the MIT License, and built for 1.21.11. Half A Heart Mode is client and server for 1.21.8 – 1.21.11.

ModLoadersGame versionsEnvironmentUpdated
OneHPFabric1.20.5 – 1.21.11Client and server2026-02-02
Easy HardcoreFabric1.21.6 – 1.21.11Client-side only2026-02-14
Three Lives FabricFabric1.21.11Server-side only2026-06-03
Half A Heart ModeFabric1.21.8 – 1.21.11Client and server2026-04-11

Questions

Does OneHP need to be installed on the server?

Yes. Every player and the server need a copy of the mod.

Which game versions does OneHP support?

Files exist for 1.20.5, 1.20.6, 1.21 – 1.21.11, with 14 release versions in total and Fabric as the only loader.

In the catalog

OneHP is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 19,862 mods support Minecraft 1.21.11.

Game mechanics mods29,952Fabric modsMods for 1.21.1119,862

More from lakakoy

All projects
SoloSlot1.20.5 – 1.21.11

Similar mods

Better Third Person1.16.4 – 1.21.8Sounds1.20 – 26.3Cut Through1.18.2 – 26.3Bad Wither No Cookie - Reloaded1.12.2 – 1.21.10Carpet1.14.4 – 26.3Client Tweaks1.12.2 – 26.3

What the author says

Sets player max health to 1 HP, so any hit is lethal. Great for hardcore challenges, speedruns, and custom maps. Simple mod with no config, just instant extreme difficulty. Perfect for masochists! lol
lakakoy, on the Modrinth page

Official listing

Owner
lakakoy
Published
2026-01-31
Updated on Modrinth
2026-02-02
Facts verified
2026-10-15

Tags

Game mechanics
Open on ModrinthCompare