
Fabric Reinforced Obsidian
Fabric Reinforced Obsidian adds the reinforced obsidian, which is a wither-proof block, that is, it can't be damaged by explosions, not even ones from the Wither.
Screenshots

About this Mod
Fabric Reinforced Obsidian
This mod adds a block called reinforced obsidian, that can't be broken by the Wither. It also adds reinforced bars used to create the reinforced obsidian. The block itself comes from EnderIO and although the textures are similar, I recreated them in paint.net myself. This also means that they are subject to change.
There are reinforced obsidian slabs, stairs and walls, plus reinforced glass and tinted glass. They all serve the same function.
Reinforced obsidian blocks allow the player to build a safe Wither cage with as little as 6 of them! (You could potentially just use the bedrock on the nether roof as a substitute for the block below the Wither. Anywhere else, though, that block is needed)

How to use
To make reinforced iron bars, substitute the iron ingot on the center slot of a vanilla iron bar recipe for a netherite ingot.
You can craft the reinforced obsidian with four iron ingots, four reinforced iron bars and one obsidian:
From version 1.18.1-1.0.5 forward, both reinforced glass and reinforced tinted glass have been added to the game. Just like their reinforced obsidian counterpart (and its variants), both blocks are wither resistant as well! The reinforced obsidian glass can be crafted with four obsidian, four reinforced iron bars and one glass. The reinforced tinted glass can be crafted with one reinforced glass and four amethyst shards.
F.A.Q.:
Q: Will you port this to Forge?
A: No. If you want to do it, please contact me.
Q. Can you port this to [older version]?
A: No.
Q: I don't like the recipes! How do I change them?
A: Use datapacks.
Q: Can I translate this mod and provide the lang file?
A: Of course! Feel free to do so.
Available Versions
How to Install Fabric Reinforced Obsidian on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.8).
Install Mod
Open the mod browser in the dashboard and search for "Fabric Reinforced Obsidian". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.8, 1.21.7, 1.21.6 (+6 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Fabric Reinforced Obsidian server crashes on startup – what to do?
Most common cause: wrong fabric 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 (1.21.8). You can switch loaders with one click in the panel.
Is Fabric Reinforced Obsidian compatible with fabric?
Fabric Reinforced Obsidian officially supports fabric for Minecraft 1.21.8, 1.21.7, 1.21.6. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Fabric Reinforced Obsidian – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Fabric Reinforced Obsidian 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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Install Fabric Reinforced Obsidian with just one click on your server.