THE MOD IS FOR FABRIC
It adds a rare ore you can find the end.
You can upgrade netherite armor and tools in a smithing table with a ingot. You craft the ingot with the endsteel chunks which you get from smelting the ore.
There are also new items and tools you can craft with the ingot such as a endsteel bomb.
The new armor and tools are very powerful but also balanced for a server.