
A Heart of Crystal
Adds a rare ore that lets you increase your maximum health and adds two health-related gamerules (Losing hearts on death and setting how many hearts you start the game with).
Screenshots






About this Mod
A mod that adds a rare ore that lets you increase your maximum health and causes you to lose a heart upon death, making your hearts a precious resource.

New items:
Heart Shard
Heart Crystal
Hold right-click for 2 seconds to consume and gain one heart
(Also doubles as a musical instrument).Heart Crystal Upgrade (Unobtainable in Survival as of v1.1.0)
Used to create the Heart Crystal Chestplate in a Smithing Table
New Equipment:
Heart Crystal Chestplate (Unobtainable in Survival as of v1.1.0)
Grants varying levels of Regeneration while equipped, based on how much health you have.
11+ hearts: Regeneration II
6-10 hearts: Regeneration I
5- hearts: None
New blocks:
Heart Crystal Ore & Deepslate Heart Crystal Ore
Generate similarly to Ancient Debris in the overworld from Y: 16 to Y: -64.
Heart Crystal Block
New gamerules:
Lose heart upon death
If the gamerule "heartLossUponDeath" ("Lose heart upon death") is enabled, upon dying, you will lose one heart of max health (With a minimum of 3 hearts). This can be toggled on/off, but is turned off by default as of v1.1.0.
Number of hearts to start with
You can set the number of hearts you start the game with with the gamerule "startingHearts" ("Number of hearts to start with"). By default, this is the vanilla 10 hearts. This can't be set below 3 or above 10.
I wanted to do my own take on this kind of mod, since I like the idea of it being an ore and I think the Heart Crystal concept could work well with the idea of max health loss (I know that part isn't for everyone though, hence it being opt-in via the "heartLossUponDeath" gamerule) and the idea of starting a world with fewer hearts. If you choose to use this mod, I hope you enjoy it! And feel free to use this mod in modpacks if you want, I'm sure it'd work well with other mods. :)
(NOTE: I have yet to test this in a multiplayer environment, so there may or may not be bugs related to that. If there are, please let me know)
(NOTE 2: I removed the Heart Crystal Chestplate as it honestly felt like bloat to me, but I may or may not add it back in the future. Not sure tbh. I kept the item itself in the game because I didn't feel right removing it outright (Especially cause some people may have already obtained it and I don't wanna rip it away from them if/when they update), but it is no longer obtainable in Survival, only via the "/give" command)
Available Versions
How to Install A Heart of Crystal on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set forge Loader
In the panel under "Egg", select the forge loader and matching Minecraft version (1.21.4).
Install Mod
Open the mod browser in the dashboard and search for "A Heart of Crystal". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.4, 1.21.1, 1.20.1
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
A Heart of Crystal server crashes on startup – what to do?
Most common cause: wrong forge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.4). You can switch loaders with one click in the panel.
Is A Heart of Crystal compatible with forge and neoforge?
A Heart of Crystal officially supports forge, neoforge for Minecraft 1.21.4, 1.21.1, 1.20.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with A Heart of Crystal – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if A Heart of Crystal consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install A Heart of Crystal with just one click on your server.