This is not going to spoil any of the story it will purely explain how the power system works and functions
Mana
The mana of my story will function under the concept of typical stories, mana fuels magic, magic can change the world if enough is used, some have an easier time, fire magic can burn a forest with a well placed fireball in the correct environment, earth magic can alter a mountain with a well placed mudslide.
MAGIC RANKINGS
Magic is ranked from F, E, D, C, B, A, S, SS, SSS and forbidden.
each spell is also ranked between 1-5 ☆ with full proficiency in a star producing a ★ this allows someone to change an aspect of a spell, a wind blade becomes sharper, a fireballs temperature increases, a earth wall increases in density.
A persons affinity comes in many ways from their personalities to their efforts, a person that works around water all day with a grounded personality may gain let's say a mud affinity allowing them to manipulate mud, or earth and water separately with better combinations.
AURA
Aura like mana is a fuel, but instead of it being a fuel for the world, it will be a fuel for the body and soul, it is shaped by the soul, if a person is calm and collected their soul is stable and their body follows. Aura follows the same ranking as magic does, with stars being mostly the same, except instead of when a star becomes ★ you don't change a concept of your Aura you change a Concept of your SOUL, this can be anything from adding and affinity to something more… unique, like scales, whatever happens to your soul your body follows.
CLASSES
Classes are a privilege to those who are geniuses, those who fight, those who try, the weak remain classless. Habit makes them, if you fight with a sword, you become a swordsman, if you're talented with fighting you become a brawler.
Classes can evolve, like a brawler into a fire brawler, or a mage into a earth mage, these evolutions are both a boon and a chain, if you go all in on a path you can only traverse that path or try and EVOLVE it into a different type, it can be very dangerous, a fire mage can still use other types of magic but with a weaker output.
EVOLUTION
Self explanatory it happens when milestones are reached, or special materials are found, different organisms evolve different ways, a human may evolve scales without using aura by fighting a kobold.
STATS AND MATH
Stats as following are these
Strength(Str): 1 point in strength is equal to 10 pounds of force, 100 lbs of force equals 10 points of strength, functions less effectively when dexterity and vitality drag behind
Dexterity(Dex): 1 point in dexterity is equal to 10 mph in 5 minutes, 1000 mph is equal to 20 points in dexterity, functions less effectively without sufficient strength and vitality
Vitality(Vit): 1 point in vitality equals 5 lbs force the body can endure, ability to heal and recover(determined by lethality, a bruise can heal in minutes due to mana without heal spells, while a cut off finger may need regeneration from 100 points in vitality (the minimum to heal cuts within 2 minutes outside of a fight is hard set at 20), determines determines stress body can endure before bones break.
Intelligence(int): 1 point in intelligence is 10 points of mana, this includes density and purity of mana, purity and density influence mana strength 5 point makes a water ball hit like a punch
Mana: 10= (int) * (vit) strong mana without a suitable body can make the body explode(imagine a balloon popping, this is to endorse actual growth for people)
Luck: 1 is the equivalent of killing 10 trolls but only obtaining 1 troll heart while the others give 1 liter of troll blood