Isekai-Eryndor

An ordinary day at school ended with a blinding flash. 15 high school students were transported to a new world: Eryndor, a magical land divided by ancient wars and forgotten secrets. They were summoned as heroes...

1. Medieval European aesthetics (castles, kingdoms, guilds, villages, knights).

2. Magic as a central resource (spells, artifacts, magic academies).

3. The system (levels, stats, adventurer guilds, character classes).

🌍 The World and its Regions:

Human kingdoms → Feudal monarchies with kings, nobles, and knights. They are often at constant war against demons or monsters.

Elven Forests → Lush nature, spiritual magic, archers and druids.

Dwarf Mountains → Stone-carved cities, filled with forges and mines.

Wild Lands → Dungeons, ancient ruins, caves filled with monsters.

Dark Castles → Home of the Demon King or great villains.

🏰 Society and Culture:

Adventurer Guilds → These are like unions where heroes register quests, receive rewards, and rank up (C, B, A, S, etc.).

Medieval Economy → Gold, silver, and barter. Currency is closely linked to the trade of potions, weapons, and magical materials.

Religion and temples → Places of healing, resurrection, or prophecy. The protagonists are often invoked by priests.

Magic Academies → Schools where the elements, runes, and spells are studied.

⚔️ The System:

This is what makes medieval gamer isekai special:

Classes and roles → Warrior, mage, priest, thief, summoner, archer, etc.

Levels and experience → Each victory against monsters increases stats.

Stats → Strength, agility, intelligence, vitality, luck.

Unique Skills → Special powers that make a difference (example: legendary skill, forbidden magic or protagonist cheat).

Inventory and Equipment → Magic swords, rare armor, grimoires, potions.

Quests and dungeons → Challenges where you face monsters and obtain treasures.

👹 Threats and Conflicts:

Living Dungeons → Places that generate monsters infinitely.

Magical beasts → Giant wolves, wyverns, mutant slimes.

Demon armies → Troops organized under a Demon King.

Human betrayals → There are not only external enemies, but also corrupt nobles, wars between kingdoms or guild rivalries.

The Void → A cup that corrupted and is leading that world to ruin.

-Aristocratic empires and kingdoms

-Feudal empire, with majestic castles, noble families, dukes and princes.

-Academies of nobility and magic

Learning spaces for young aristocrats: there they study etiquette, politics, combat, and magic.

They become places of rivalry, romance and conspiracy.

Imperial palaces and royal courts

They are the core of power, where intrigues, alliances and betrayals abound.

The protagonist often has to survive among corrupt politicians or jealous rivals.

✨ The Magic and Game System

Although it is medieval, it has an air of a narrative system inspired by RPGs or romance novels:

Elemental magic → fire, water, wind, earth, light, darkness.

Mana and affinity → each person has a “magic attribute” with a different level of rarity (example: affinity with light or time = very rare).

Magical items → rings, grimoires, ancient relics.

Written prophecies and destinies → many times the protagonist knows what will happen because she read the original novel or played the game before being reincarnated.

Game “routes” → There are good endings (happy ending) and bad endings (bad ending), and the protagonist struggles to change her destiny.

🏰 Society and Culture

Rigid social hierarchy

Royal Family > Grand Dukes > Nobles > Knights > Commoners.

This creates tension and drama, because the protagonist must overcome social prejudices.

Arranged marriages

Many times the plot revolves around commitments, divorces, second chances, or avoiding a tragic fate.

Parties, dances and banquets

Recurring scenarios where revelations, scandals or conspiracies occur.

The world of Eryndor is a medieval fantasy world, where humans and magical and fantastical creatures coexist, although that doesn't mean there are tribes of creatures that are wild and devoid of reason. However, there are also peaceful creatures and even other races that coexist peacefully with humans. Races like elves, dwarves, and mermaids are the most common, although there are many more...

The demon realm is a different story, as they hate other species and are always causing trouble and instilling terror.

1. Kingdom of Eryndor → The greatest of all. Land of knights, floating castles, and griffin-mounted cavalry. Its capital is Lunaris, a city with crystal towers and bridges of magical light.

2. Kaer Thar Empire → A land of endless deserts, ruled by a tyrannical Emperor. Its cities are made of black metal and sand. Its army uses giant worms as living weapons.

3. Sylvath's Domain → Endless forests, home to elves, dryads, and intelligent beasts. The cities are giant trees connected by natural bridges.

4. Zephyria Archipelago → Floating islands in the sky, connected by magical bridges. The world's most powerful wizards live here.

5. Important towns:

Thalnos Village: Farming village where your adventure begins.

Redmist Port: Coastal town taken over by pirates and illegal traders.

Blue Echo Village: A village hidden in the forest, where an ancient prophecy related to you lives.

1. Extreme formality

They use titles and ranks throughout: Your Highness, My Lord, My Lady, Duke, Count, Baron.

Even among family members, protocol is maintained if the situation requires it.

2. Refined structure

It is spoken in long, polite and sometimes indirect sentences.

Example: Instead of saying “I don’t want that,” they would say “I’m afraid that decision is not to my liking.”

3. Double-edged language

Many phrases have a diplomatic double meaning, where they seem polite but are actually threats or contempt.

Example: “Your Excellency has an interesting point… although perhaps too naive for this advice.”

4. Condescending or distant tone

Nobles often address those of lower rank in a cold manner, as if they were natural inferiors.

Example: “A commoner should not dare to express an opinion on court matters.”

5. Use of the archaic or literary

A tone that sounds ancient and solemn is often used, similar to translations of period European novels.

📚 Examples of typical expressions

Respectful greeting:

“I have had the honor of being summoned by Your Excellency.”

“I bow before your presence, Your Highness.”

Veiled contempt:

“How endearingly innocent is your perspective, though unrealistic for these times.”

“I expected nothing less… from someone of his origins.”

Political intrigue:

“The Imperial Council will undoubtedly welcome your proposal with… the attention it deserves.”

“Let me remind you, my lord, that pacts sealed with words do not always last.”

Romantic language in nobles:

“It would be the greatest honor of my life to accompany you to this dance.”

“If you allow me, my lady, your radiance outshines all the flowers in this garden.”

✨ Contrast with other characters

The commoners → speak simply, directly, even with idioms.

Gentlemen or servants → are respectful but less refined, with short phrases like “Yes, my lord!” or “I am at your service.”

👑 1. Royal Family / Emperor

Emperor / King / Queen → supreme rulers of the empire or kingdom.

Princes and princesses → direct children, with titles of “Their Royal Highness”.

Role: highest political and military authority; they decide wars, royal marriages, and inheritance of the throne.

Language towards them: extremely formal and reverent.

🦁 2. High Nobility

Grand Dukes / Archdukes

They control vast regions and have almost as much power as the royal family.

They are often allies or direct political rivals of the emperor.

Dukes

Rulers of vast territories; influential families vying for prestige.

Many protagonists are reborn as daughters of dukes.

Marquises

They guard important military borders and lands.

They usually have strong armies, because they protect against invasions.

🦅 3. Middle Nobility

Counts

Rulers of medium-sized territories, with their own castles and vassals.

Important in the imperial council.

Viscounts

Nobles of lower rank, but still with political power and land.

Barons

Lowest level of recognized nobility.

They have small territories or serve larger nobles.

⚔️ 4. Knights and Orders

Gentlemen

Warriors with honorary titles, but not always with land.

They serve a higher noble or the royal family directly.

Orders of chivalry

Elite groups with oaths of loyalty, often defenders of the kingdom or church.

🌾 5. Common Class

Free commoners

Merchants, artisans, peasants.

Some achieve wealth, but remain without noble recognition.

Servants and servants

They work in palaces and mansions.

They tend to have loyalty to specific noble families.

Peasants

Base of society, they live from agriculture and pay taxes to the nobles.

⛓️ 6. Lower / Marginalized Class

Slaves or servants

There are slaves, especially prisoners of war or debt.

Other worlds soften it by calling them “indentured servants for life.”

Exiles, criminals and vagabonds

They live outside the social system.

They can become bandits, mercenaries or rebels.

🧙 Extras

Tower Mages / Archmages

They sometimes have a rank independent of the nobility, but are respected at the level of a duke for their magical power.

Saints

Religious elect with divine powers. They are even above some nobles, although they are not royalty.

🐉 Great and Legendary Creatures

1. Dragons

Description: Gigantic beings, with resistant scales, enormous wings and the ability to spit fire (or ice, poison, magic, depending on the world).

Role in isekai:

Sometimes they are legendary enemies that the hero must defeat.

Other times they are ancient sages who teach ancient knowledge.

They can also become companions (example: Kobayashi-san Chi no Maid Dragon).

2. Hydras

Description: Reptilian monsters with multiple heads. If one is cut off, they usually regenerate or grow more.

Role: They serve as final bosses of dungeons or guardians of treasures.

3. Taps

Description: Lion's body with eagle's wings and head. Majestic, swift, and strong.

Role: Elite mounts for kings, holy knights or magical guardians.

4. Phoenix

Description: Magical bird of fire, associated with immortality and resurrection.

Role: Can be a very powerful enemy or an ally that heals and revives.

👹 Monstrous Humanoid Creatures

5. Goblins

Description: Small, green, deformed, intelligent in packs but weak individually.

Role: They are usually the first enemies that the protagonist faces in an isekai, in caves or forests.

Curiosity: Some isekai show them as more organized and dangerous (Goblin Slayer).

6. Orcs

Description: Large, muscular, greenish or gray skin. Brute strength but low intelligence.

Role: Basic troops of demonic armies or fantasy bandits.

7. Ogres and Trolls

Description: Giant creatures of great physical strength, tough skin and slow intelligence.

Role: Guardians of bridges, dungeons or forbidden lands.

8. Kobolds

Description: Small creatures, sometimes depicted as humanoid dogs or lizards.

Role: Miners, explorers or low-level creatures.

🧚 Intelligent and Magical Races

9. Elves

Description: Stylized humans with long ears, great beauty, and longevity. They are often experts in magic and archery.

Role: Civilized allies, magical guides, or sometimes arrogant rivals of humans.

10. Dwarves

Description: Short, robust, bearded, great blacksmiths and master miners.

Role: Creators of legendary weapons or loyal allies.

11. Fairies and Spirits

Description: Small, bright beings or manifestations of elements (fire, water, wind, earth).

Role: They serve as magical guides or supports in battles.

12. Beastmen

Description: Humans with animal features (wolf ears, cat tail, bear strength, etc.).

Role: Allied peoples or savage tribes. They often symbolize the union of human and animal.

😈 Dark Creatures

13. Demons

Description: They vary widely, from horned humanoids to terrifying beasts. Powerful, cruel, or cunning.

Role: They can be main villains or even protagonists if the isekai reverses roles.

14. Demon King (Maō)

Description: Supreme ruler of demons. Often immensely powerful, a symbol of evil or chaos.

Role: Final enemy that the protagonist must defeat… or, in certain isekai, it could be the protagonist himself! (Maou-sama, Retry!).

15. Vampires

Description: Immortal humanoids that feed on blood, with powers of regeneration and dark magic.

Role: Elegant antagonists, but also sometimes companions (example: Overlord with Shalltear Bloodfallen).

16. Undead

Description: Skeletons, zombies, liches (undead wizards).

Role: Low-level dungeon troopers or necromancers' servants. In some isekai, the protagonist may be an undead creature (Overlord).

🪱 Various Adventure Creatures

17. Slimes

Description: Small, seemingly weak, gelatinous masses that absorb things to grow.

Role: Basic enemies… except in isekais like That Time I Got Reincarnated as a Slime, where they are OP.

18. Manticores

Description: Lion body, bat wings, poisonous tail.

Role: Rare, difficult-to-defeat beasts that appear as bosses in the desert.

19. Basilisks

Description: Monstrous snake or rooster with a petrifying gaze.

Role: Dungeon creature that generates terror and forces you to search for special strategies.

20. Wyverns

Description: Small dragons with two legs and large wings.

Role: Flying troops, weaker than a true dragon, but in a pack they are fearsome.

All transported can see a floating Magic Interface, visible only to them:

● Levels and Experience (EXP): You level up by defeating monsters, completing quests, or solving special events.

● Classes: Each one develops a class: Warrior, Mage, Summoner, Assassin, etc., or unique evolutions depending on their actions.

● System Missions:

Primary: Survive, discover the purpose of your arrival.

Secondary: Help villages, defeat creatures, explore ruins.

● Destination Points (DP): With them you can improve skills or acquire special powers.

🧝‍♂️ Light Elves (Altari)

Description: Tall, fair-skinned, and with golden or silver eyes. They live in the sacred forests of Sylvath. They are masters of elemental magic, especially wind and light.

Cliché: Proud, elegant, and contemptuous of humans at first, but some end up allying with the heroes.

🌑 Dark Elves (Drell'Kar)

Description: Dark or gray skin, red or violet eyes. They inhabit underground cities and abandoned ruins. They master dark magic and curses.

Cliché: They were once light elves, but were cursed. They are natural enemies of the Altari. Some will join the transported out of self-interest.

👹 Orcs of the Abyss

Description: Large, muscular orcs with split horns. They live in black stone fortresses. They wear rusty armor and carry large axes.

Cliché: Some orc clans reject wars and help heroes, breaking stereotypes.

🐲 Primordial Dragons

Description: Gigantic beings who control the elements (fire, ice, lightning, shadow). They sleep in hidden caves or on forbidden mountaintops.

Cliché: The protagonist has an inexplicable connection with one of them.

🐺 Lycanthropes (Children of the Red Moon)

Description: Cursed humans capable of transforming into giant wolves under the full moon. Some control their transformation.

Cliché: A classmate was bitten by one.

🦄 Black Unicorns (Nocturnus)

Description: Black horses with obsidian horns, capable of teleportation and launching magic rays.

Cliché: They only allow riding by someone “with a heart divided between light and darkness.”

🧟‍♂️ Legions of Undead

Description: Ancient fallen armies, revived by sorcerers of the Kaer Thar Empire.

Cliché: A fallen ancient king seeks revenge and sees the transportees as a danger to his plans.

🦅 Taps

Description: Half lion, half eagle. Used by the elite knights of the Kingdom of Varethia.

Cliché: Heroic mounts for epic aerial battles.

🦑 Ancients of the Abyss (Kralth'zar)

Description: Tentacle-like creatures that emerge from cracks in the sky. They speak ancient tongues that corrupt the mind.

Cliché: “The arrival of the heroes upset the balance… they also awakened them.” 🦋 Fae (Wind Fairies)

Description: Small, mischievous but powerful winged creatures, allies of the elves.

Cliché: The most powerful of all takes a liking to the protagonist and calls him “Clumsy Master.”

🐍 Crystal Snakes

Description: Large snakes made of translucent scales. They live in hidden mountains and lakes.

Cliché: They keep legendary items and ancient evidence for the heroes.

Heroes with broken abilities but who still don't know how to use them well.

Classmates who become villains or rivals.

An arrogant elf who later becomes the protagonist's best friend.

A sword sealed in a forgotten temple that only the protagonist can unleash.

Impossible missions given by divine entities or mysterious systems.

Betrayals between kingdoms that hide dark pacts with demons.

A prophecy mentioning the "Children of the Otherworld."

A corrupt church trying to control the transported.

🌀 Name of the Power:

“Ars Magna — The Art of Absolute Creation”

📜 General Description:

It allows the wielder to create anything they can imagine: weapons, creatures, items, even abstract concepts like “silence” or “eternal darkness.” But the more complex or powerful what you want to create, the more expensive it is for your HP.

⚙️ Rules of Power:

1. Key condition: You can only create what you fully understand. If you know them or know what they're like.

2. Cost: The larger the creation, the more it drains your life or mental energy. → Create a stone: 1 HP. → Create a castle: 40 HP. → Create an army of creatures: 60 HP.

3. Progression: → At the beginning: small or simple objects (weapons, tools). → With training: creatures, magic items, artifacts. → Final stages: create abstract concepts, alter magical laws, rewrite part of the world.

🗝️ Activation Method:

You invoke the power with a mental or verbal phrase:

“Ars Magna…”

Then you name what you want to create. Example:

“Ars Magna… forge a sword that cuts through fire itself.”

⚔️ Special Techniques (Examples):

1. Minor Creation: “Material Fractals” → Create small weapons or tools instantly.

2. Conceived Beast: “Smoke Leviathan” → Summons an ephemeral creature made of solid fog.

3. Embodied Concept: “Absolute Silence” → Generates a space where there is no sound or magical vibrations.

4. Forbidden Creation: “Duplicate of Itself” → Creates an imperfect copy of yourself, but each use consumes a portion of your HP.