If you want to Know about the structure of the cosmology you can check it here.
The Earth: This is Nothing just our normal earth but it also has Dungeons, rank. Heroes and stuff.
The Mana: The power system is called Mana its simple and normal. The Mana determines the rank and the class based on the type of Mana they posses. The Mana has colors that tells the class (Yellow, Red, Purple. Green, Blue)
The Class: There are 5 classes (Knight, Assassin, Mage, Healer, All rounder) and when a person awakens a class they are given a skill related to their class as soon they awaken
Knight: Knight's are tanks who are very durable and have strong attack power but their are really slow and they are close combat type and the knights have Yellow Mana color.
Assasins: Assassin's are really Agile and fast type but they aren't very durable and they have bit higher attack power then normal Humans but assassin are really stealthy and they aren't easy to sense and assassins have Red mana color
Mage: Mages have magic powers based on elements(Fire, Water, Ice, Wind, Earth, Thunder) Mages have High IQ and they have really slow attacking speed and aren't much durable but they have most attack power from every other class and they also have a very wide AOE range that gives them huge advantage and they are usually in back lines and they have Blue Mana color.
Healer: Healer are very Tanky and they have power to heal anyone and they can't fight and aren't that fast but their healing power is insane as they can regenerate Body parts, revive dead but it depends their rank and the ammiunt of Mana they posses and they also buff allies an create barrier that can absorb attack and they have Green Mana color.
All rounder: All rounders have balanced status they have Same Attack, Speed, And Durability and they are mostly very skilled in weapon mastery and but they have a disadvantage and thats they can't cannot gain any Ability unlike other classes and they have Purple Mana color
The Rank: The ranks in this world Range from S to E rank based on the amount of Mana a person contains and the S-ranker are the top of the world and only 7 S-rankers exist currently.
The S-ranker
Anthony Andrew: He is the Amarican S-rank and he is called the strongest of the S-rank and he is a Tank type and he is called the Shield of America.
Salman Vijay: He is a All rounder and he is a Indian S-ranker and he is a Grand master in swordsmanship and his swordsmanship is so perfect that he can cut things at Atomsize.
Sayaka Fujiwara: she is a Mage type and she is a Japanese S-ranker and she is the best Mage type in entire world as she can create magic circles that can cover entire Cities and she possesses (Fire, Thunder Element)
Ye Tiem: He is the Korean S ranker and he is a Assassin type and he the faster among all S-ranks and he is very deadly and merciless and he so fast he was able to travel the entire world in few seconds and he was able to Dodge sayaka thunder attacks he fight with daggers that have poison on them.
Chin Chong: He is the S-ranker of China and he is a Healer and he can revive dead peoples and can create barrier able to cover entire cities and he can heal his brain and heart from any injury and he can regenerate others and buff other peoples power by 69% temporarily.
Dungeons:
There are dungeons that range from S-E rank and with each rank the difficulty increase and if a dungeon isn't cleared for 10 days it'll break out and monsters with starts coming out of the dungeon and attacking others and the dungeons have different time Axis 10 minutes outside = 1day in dungeons and dungeons are infinite in size but there are boss chamber. After defeating the boss the dungeon closes in 24 hours. Dungeons have different place setting based on boss (Ocean, Desert, Forest)
Rifts: Rifts are dungeons but they are connected to different Parallel Dimension and those dimension are devoid of time Space and these are High-risk and Hug-rewards Rift have monster that are as strong as S rank monsters in dungeons and every Rift is S-rank and the bosses of the rifts are SS rank thats only made for Rift and the rewards for clearing Rifts are (Skill stone, Equipment, Weapons)
Skill stone: Skill stone can give permanent skill but its completely random which skill will be given because it can give skill from any class and there's a 2% chance for a Skill to be Granted that is related to Time-space and can affect it.
Equipment: The Equipments are usually Armors that gives special affects or resistances.
(Affects: the affects that can be granted can be a random element power control, or it can enhance any random stat(STR,SPD,DEF,STA OR MANA capacity with can help in increasing rank. And the resistances given can be Elemental, Mind, physical, soul or with 2.2%chance of space time resistance and these resistances are from(80% to 100%) and these are random
Weapon: the weapons obtained can be elemental that can control any element or Its can be like Spritual attacking, mind attack, defend, regeneration bypassing weapon, or a 1%chance of a space-time weapon. The weapons are (Sword, Spear, Bow, Scythe, Gun) these are random
There's still more stuff to add