Plugin that adds upgradable stats to every player
Only mineralogy and looting are not working, every other statistic is working and level-related.
When you first log in, every player will get a maximum level, starting from 30, up to 100. All the statics will be upgraded 4 times while ranking up, so even an "F" stat will get to a "B". Levels goes from "F" to "SSS", but players can only start with a maximum of "S".
Statistic chance:

• F: 15%
• E: 25%
• D: 25%
• C: 15%
• B: 12%
• A: 7%
• S: 1%

Xp points given from mobs:

• 5 xp: silverfish, endermite
• 10xp: zombie (12xp baby zombie), skeleton, vex
• 15xp stray, bogged, shulker, blaze, phantom, pigman, piglin, witch, witherskeleton, husk, creeper (20xp if charged)
• 20xp enderman, breeze, hoglin, zoglin, guardian, pillager
• 25xp: vindicator
• 35xp: piglin brute, elder guardian, illusioner, ravager, evoker
• 60xp: warden
• 500xp: ender dragon, wither