kfear's Masteries is mainly worth checking through progression, XP, perks, and unlock pacing, combat, survival values, buffs, and penalties, and loot, crafting, trader, and resource loop. Do that in a copied save or test server before changing a main world.
Use Nexus Mods listing for exact file names, branches, screenshots, and update notes, then confirm the in-game behavior listed above still works after a restart.
- Check the first few days and one mid-game milestone before deciding the balance works.
- Test a small POI, night travel, injury recovery, and one restart.
- Check whether the MOD changes where players get power, resources, or comfort.