LUTHERDAL: The world our MC gets transmigrated into. It is also known as the Lost World since it's so large and complex that some places have not been explored yet. It was during this exploration that humans discovered they could use mana and gain what is called an Order, as well as different kinds of supernatural abilities. Over the years, mana evolved from something only nobles could use to something anyone could learn, as long as they had the affinity.
HUNTERS: These are people who have an affinity with mana, have awakened it, and actively use their mana, whether for good or bad.
VILLAINS: To some, villains are simply those who commit evil, but actually, villains are a classification of people who possess both human (Hunter) genes and Devil King genes. Since no Devil King has appeared in a thousand years, they all inherited it from their ancestors. To survive, they need to cause chaos, so no, there isn't a good villain unless you want to die. If they don't cause chaos, their lifespan slowly decreases.
ORDERS: This is the main power used by Hunters and Villains that lets you change a specific way the world can function for you. For example, your Order might allow you to form fire with mana each time you snap your fingers; if you never snap, you can't form fire.
Naturally, these abilities are classified according to how dangerous they are: F, E, D, C, B, A, and S. Beyond that are SS and SSS, which only gods possess.
Once you have an Order, you cannot change it forever and can only grow its potential and uses with your rank.
RANKS: There is no fixed talent grade that determines your future rank. If you don't reach high, just blame your luck—or maybe your Order. And yes, someone with a stronger Order will be stronger than you, even at the same rank.
To increase rank, you must kill a Stranger of equal rank. Strangers are far stronger than Hunters or Villains, even at the same level. The greater the Order of the Stranger you defeat, the stronger you will become when you advance.
If you cannot meet this condition, you may instead find strangers who give quests, trials, or games, once you complete it the stranger will vanish and it will counted as a kill. If you can't even do this and want the fastest way to power then you have to obtain an artifact of equivalent value to the rank you want to reach.
Advancing in rank amplifies your strength exponentially—transforming your body, deepening your control over your Order, and vastly expanding your mana capacity. On rare occasions, a rank advancement may even result in your Order evolving to a higher grade.
Ranks:
APPRENTICE
EXPERT
MASTER (Very few reach here)
SAINT
OVERLORD/EMPEROR (Peak humanity)
SUPREME (Godhood)
TRANSCENDENT (Godhood)
VOID (Impossible)
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STRANGERS: Any being that isn't human which inhabits Lutherdal, whether they have been discovered, are constantly hunted, or no one has heard of them.
RANKS: They are ranked based on their mana frequency.
SPIRIT
DIVINE
ANCIENT
MYTHIC
TITAN
UNHOLY
COSMIC
SEQUENCE: Just like humans have ranks based on the strength of Orders, strangers have ranks based on the strength of their own Order (yes, they also have a single Order, and some strangers can talk). This rank can be known by how many cores they have in them.
The world system also shows their rank when it comes close to you. The higher their tier, the more cores you have.
Sequence 7 = S-rank Order
Sequence 6 = A-rank Order
Sequence 5 = B-rank Order
Sequence 4 = C-rank Order
Sequence 3 = D-rank Order
Sequence 2 = E-rank Order
Sequence 1 = F-rank Order
So a Sequence 7 Spirit stranger is equivalent to an S-rank Apprentice Hunter.