Power system:
There is no level restriction in the world, as my idea just doesn't allow for a proper classification by level - it would just be a stagnation of the idea.
Also level doesn't really determine the outcome of combat, the level system doesn't take skills and abilities into account. So even a level 50, with the skills and experience of a war veteran, can beat a level 100 who is new to combat.
Characteristics may not make much difference to the outcome of the battle either, as if you only have strength like Saitama, but lack his speed and defense, you'll die more quickly without hitting your target or withstanding your opponent's strike.
Uncertain facts or accidents can also play into the battle, which can also change the course of the battle.
The world:
The world itself is vast and quite varied in its fantasy-type beauty. The world or planet itself does not have a name, as no one has given it much thought initially. Therefore the world is often referred to as "Earth".
There are many ideologies and religions that can closely overlap. Gods also exist, but cannot interfere because of the rules of the "Creator God". Whose religious authority and prominence is above all others.
There are also historical figures of various nations from the history of the ordinary world. Perhaps not all of them will repeat all their events and endings.
Continents:
There are several huge continents with their own flora and fauna as well as the historical life of different races and small tribes.
The largest continent is the one where the main character was born . And where the biggest conflicts of the world and the struggle for resources, of which there is a great deal, take place.
Few can find any other unknown continent, as beyond the wild sea, there is an impenetrable fog. And those who have tried to cross it simply disappear and never return.
Different worlds:
Land, sky, sea, this world is not limited and there are many different worlds that intersect with each other with the most important in the story: Heaven, Hell, Paradise, Underworld, Parallel World, World of the Dead, World of Chaos, World of the Abyss, World of Darkness, World of Shadows, World of Fear, World of Dreams, World of Destruction, etc.
Each of these worlds has a ruler or someone who maintains order in it. Most often there is some kind of burden placed on such individuals, which can in some sense exhaust them over time, but also give many benefits. Without a ruler or someone who holds that office, the world will simply collapse or forcibly find itself a keeper.
Energy:
Mana is a mysterious source of energy that permeates the entire world and all living beings in it. The power of this energy allows all beings to perform all sorts of miracles. Which humans and other races call "magic", if of course you have a huge amount of supply for it and skill, then you are capable of almost anything.
Also mana has quite a strong effect on normal living organisms. Because of this even a weak race of humans live about 100-150 years on average. They've also become physically stronger and more resilient. Medicinal and common plants have also become healthier and better from this as well as poisonous plants.
CI is the inner energy that every living being and self has. If you use it correctly, it is possible to control another's and kill simply by absorbing it. It combines well with magic and can even amplify it many times over. In magic like barriers and talismans, this type of energy works best.
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Races that have been added so far.
Humans.
Semi-humans (all sorts of human rabbits).
Demons.
Succubi.
Incubi.
Vampires.
Werewolves.
Angels.
Fallen angels.
Dragons.
Elves.
High Elves.
Dark Elves.
Dwarves.
Dwarves.
Water people. (mermaids)
Yokai. (Japanese mythological creatures.)
Fairies.
Spirits.
Giants.
Titans.
Gods.
Valkyries.
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Monster classes.
1. The lowest class of monsters.
2. Weakest class of monsters.
3. Middle class monsters.
4. Upper class monsters.
5. Disaster monster class.
6. Cataclysmic monster class.
7. Monster class apocalypse.
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Classes/ranks of adventurers/mercenaries:
1. E-rank adventurer. - Copper
2. d-rank adventurer. - Iron.
3. adventurer of C rank. - Silver.
4. Adventurer B rank. - Gold.
5. A-rank adventurer. - Platinum.
6. S-grade adventurer. - Mifrilium.
7. SS rank adventurer. - Orichal.
8. SSS rank adventurer. - Adamantium