Isekai World

The World of Aetherion

Aetherion is a vast continent where magic is not a privilege, but a natural force that permeates all of reality. Every living being is born with a Mana Core, a kind of spiritual organ that determines how much power it can develop during its lifetime.

Society doesn't revolve solely around money or lineage, but also around magical power. For thousands of years, kingdoms have known that the ability to protect their people from monsters and dungeons is far more important than any material wealth.

Therefore, social status depends on three factors:

The lineage.
Wealth.
The magic power.

In some places, a commoner with enough power can have more authority than a nobleman.

The Magic

All magic comes from the Universal Mana.

Each person has a primary affinity.

Elemental Magic
Fire
Water
Land
Air
Ray
Ice
Nature
Divine Magic

Granted by gods or spirits.

Allows:

Absolute cure
Blessings
Exorcisms
Purification
Miracles
Forbidden Magic

Their study is illegal.

Includes:

Necromancy
Curses
Mind manipulation
Mana steal
Human sacrifices
The Core of Mana

All living beings are born with a Mana Core, an internal source of energy that stores and channels mana. Its capacity can be increased through training, experience, meditation, combat, and certain special methods of magical cultivation.

Although everyone has a core, not everyone develops the same potential or progresses at the same rate.

Power Ranks

The global industry uses a universal classification system.

F

Ordinary citizen.

Peasants.

Craftsmen.

Merchants.

AND

Soldier.

Apprentice adventurer.

Guards.

D

Experienced adventurer.

Gentlemen.

Professional magicians.

C

Regional elite.

Military commanders.

B

National heroes.

Generals.

Great magicians.

TO

They protect entire provinces.

They can destroy fortresses.

S

There are only a few in each kingdom.

They are considered national weapons.

H.H

Legendary characters.

They can defeat armies.

SSS

Practically mythological.

They change the course of wars.

The Classes

When the core awakens, each person gets a class.

Wizards

Specialists in manna.

Subclasses:

Archimagus
Sorcerer
Elementalist
Summoner
Sage
Charming
Alchemist
Priest
Fighters
Gentleman
Swordsman
Lancer
Berserker
Monk
Paladin
Killer
Goalkeeper
Bestiary
Hybrid Classes
Magic Swordsman
Rune Knight
Dragoon
Necromancer warrior
Martial Summoner
Hidden Classes

They only appear under certain conditions.

Dragon King
Holy
Arcane Emperor
Void Monarch
Time Bearer
The Kingdoms

Most of the continent operates under monarchies.

Each kingdom possesses:

A King.
A Queen.
Princes.
Dukes.
Counts.
Viscounts.
Barons.
Gentlemen.

However, true power often belongs to S-rank individuals.

A king would never provoke an SS adventurer.

The World Council

There is an international organization.

Controls:

The guilds.
The ranks.
Wars.
The dungeons.
Magical investigations.

Each kingdom must obey certain treaties.

The Dungeons

Dungeons appear as magical anomalies.

Some have existed for centuries.

Others are born spontaneously.

Inside there are:

Monsters.
Minerals.
Mana crystals.
Herbs.
Relics.
Legendary weapons.
Magic books.

The deeper the dungeon:

More danger.
More wealth.
Monster Cores

Each monster leaves behind a crystal.

These crystals are used for:

Create weapons.
Create armor.
Create magic batteries.
Make potions.
Feeding cities.

They are the oil of this world.

The Guilds

The Adventurers' Guild exists in almost every city.

Functions:

Register adventurers.
Assign missions.
Classify ranks.
Buy materials.
Selling information.
Organize expeditions.
Explore new dungeons.
Economy

The economy revolves around four pillars.

Agriculture
Food.
Cattle raising.
Wood.
Trade
Caravans.
Ports.
Merchants.
Craft
Blacksmiths.
Alchemists.
Tailors.
Charming.
Dungeons

They represent almost 40% of the world's wealth.

Without them, the economy would collapse.

Monetary system
Bronze Coin

Used by farmers.

Examples:

Meal.
Posadas.
Tools.
Silver Coin

Used by merchants.

Common weapons.
Horses.
Basic armor.
Gold coin

Used by nobles.

Houses.
Land.
Magical objects.
Platinum

Reserved for wealthy merchants.

Large contracts.
Dungeons.
Castles.
Mithril

It's not exactly money.

It is an international currency backed by mana crystals.

Only they use it:

Kings.
Large guilds.
Empires.
Conversion
100 Bronzes = 1 Silver
100 Silvers = 1 Gold
100 Golds = 1 Platinum
100 Platinum = 1 Mithril
How do dungeons affect the economy?

Dungeons are the continent's primary source of strategic resources. The minerals and crystals they contain allow for the crafting of everything from agricultural tools to artifacts capable of protecting entire cities. Guilds buy these materials from adventurers, refine them through the work of alchemists and artisans, and then sell them to nobles, armies, and merchants.

This generates a huge economic chain:

Adventurers earn rewards and sell loot.
The guilds collect commissions and finance expeditions.
Blacksmiths turn magical minerals into weapons and armor.
Alchemists create potions, antidotes, and parchments.
Merchants distribute these products throughout the continent.
The kingdoms collect taxes on sales and trade.

When a new dungeon appears near a city, that region usually experiences rapid growth: adventurers arrive, inns, markets, workshops, banks, hospitals, and new walls are built. Conversely, if a dungeon goes rogue or suffers a "break" and unleashes hordes of monsters, trade routes are disrupted, prices rise, and the local economy can collapse.

World infrastructure

Large cities develop around three centers of power:

The Royal Castle, from where the monarchy governs and the kingdom is administered.
The Adventurers' Guild, which regulates expeditions, certifies ranks, and maintains security in dungeons.
The Academy of Magic or Chivalry, where future magicians, knights, and specialists are trained.

Cities near major dungeons typically feature walls reinforced with magical barriers, watchtowers, teleportation stations for emergencies, and warehouses where the resources obtained are sorted and traded. Thanks to this infrastructure, the continent can maintain a balance between daily life, trade, and the constant threat of monsters.

In this world, dungeons are not merely dangerous places: they are the engine of the economy, the reason for the existence of guilds, the origin of most magical advancements, and the primary factor determining the political balance between kingdoms. A kingdom with access to resource-rich dungeons can become a superpower, while one without them will depend on trade or alliances to survive.