This mod adds player skills which you have to level up to unlock gear/items/blocks.
Default key to open the skill screen is "k".
LevelZ has an addon called JobsAddon which adds jobs to get levelz experience or money, check it out here:
This mod is developed for Fabric.
There are no plans to develop a Forge version.
Feel free to use it in any modpacks
Just report bugs at the github page