Isekai: Demon King

NOT ANOTHER COPY — YOUR HEROES BECOME WHAT YOU MAKE THEM. WIELD STAVES TO MASTER MAGIC, FIGHT WITH WEAPONS TO BECOME A WARRIOR, ENDURE DAMAGE TO GROW INTO A TANK, OR WALK THE PATH OF NECROMANCY AND LEARN TO RAISE FALLEN ENEMIES. ACTIVE AND PASSIVE SKILLS ARE EARNED THROUGH HOW YOU PLAY, SURVIVE, AND EVOLVE.

ENTER A WORLD WHERE HEROES ARE NOT IMMORTAL

Summon heroes, tame powerful creatures, strengthen your Sanctuary, and enter tactical expeditions where every decision can permanently change your future.

In Isekai: Demon King, you are the Custodian — the one responsible for summoning, training, equipping, protecting, and guiding heroes through a brutal world ruled by demons, ancient beasts, corrupted entities, and enemies far beyond ordinary human power.

You do not fight as the main hero.

You create the heroes who will become legends.

Victory creates legends.



Failure can erase them forever.

TACTICAL TURN-BASED COMBAT

Build a 2x3 formation and command every action.

Position matters.

Front-line heroes gain defensive advantages.
Central positions favor Mana.
Rear positions favor speed.

Manage:

• Turn order

• Mana

• Active skills

• Passive abilities

• Buffs and debuffs

• Status effects

• Elemental interactions

• Equipment

• Formation

• Defensive actions

• Target priority

• Team synergy

A stronger team is not always enough.

Preparation, positioning, timing, and decision-making determine who survives.

EXTREME DIFFICULTY

Isekai: Demon King is designed to challenge you.

Not every enemy is meant to be defeated immediately.

Bosses demand preparation. Powerful enemies punish careless builds. A single mistake during a dangerous expedition can destroy months of progress on a hero.

Sometimes the correct decision is to fight.

Sometimes it is to change your formation.

Sometimes it is to retreat before everything is lost.

PERMANENT HERO DEATH

During dangerous expeditions and high-risk wars, heroes can die permanently.

There are no ordinary resurrection items.

There is no simple gold payment to undo death.

There is no advertisement that brings a dead hero back.

A hero who falls may lose everything they had built:

• Levels

• Equipment

• Skills

• Passive abilities

• Battle history

• Progression

• Personal identity

Every hero you send into danger matters.

LEGACIES — DEATH DOES NOT ERASE EVERYTHING

Death may end a hero's life, but it does not necessarily end their influence.

Fallen heroes can create Legacies shaped by the lives they actually lived.

A Legacy may preserve:

• Signature abilities

• Important passive traits

• Mastered techniques

• Attribute bonuses

• Combat affinities

• Historical achievements

• Memories of important battles

But inheriting a Legacy does not grant its full power instantly.

A new hero must live, fight, survive, and prove themselves before fully assimilating what was inherited.

What they successfully inherit becomes part of their own story.

If they die, a new Legacy may be born.

Legends are not copied. They are inherited through experience.

THE 200-FLOOR ASCENDING DUNGEON

Challenge a massive dungeon built around long-term progression.

The journey spans 200 increasingly dangerous floors, moving from common beasts and hostile creatures toward corrupted monsters, dragons, demon generals, commanders, final entities, and eventually forces connected directly to the Demon King.

Every floor is an expedition.

Expect:

• Normal encounters

• Dangerous battles

• Elite enemies

• Protected treasure

• Environmental events

• Limited rest opportunities

• Pre-boss encounters

• Mandatory Floor Guardians

• Major bosses

• Unique rewards

You cannot simply rush to the exit.

The Floor Guardian must fall before progression continues.

EXPEDITIONS AND EXTRACTION

Before entering a floor, prepare carefully.

Choose:

• Your heroes

• Formation

• Equipment

• Consumables

• Backpack space

• Expedition relics

• Strategy

Your backpack has limited capacity.

Loot found during an expedition is not automatically safe.

Weapons, materials, consumables, keys, relics, ascension items and other physical rewards must survive the expedition with you.

Gold and Soul Fragments collected during the run are also temporary until the floor is successfully completed.

Retreat and your surviving heroes may return...

…but the expedition rewards can be lost.

You do not own what drops.



You own what you manage to bring home.

SUMMON HEROES — POTENTIAL, NOT AUTOMATIC POWER

Summoning gives you heroes with different:

• Star ranks

• Attributes

• Roles

• Elements

• Skills

• Passive abilities

• Potential

• Lineages

Higher rarity offers greater potential, but it does not automatically create the strongest hero.

A lower-rarity hero who survives, trains, evolves, gains equipment, develops skills and inherits powerful Legacies can become extraordinarily valuable.

Your strongest hero is not necessarily the hero you summoned yesterday.

It may be the one who survived everything.

POTENTIAL

Every summoned hero has a Potential level that influences their long-term growth.

Potential ranges from ordinary growth to exceptional talent.

Heroes with greater Potential gain more from their development and can reach extraordinary levels of specialization.

But Potential alone does not win battles.

Time, survival, equipment and decisions still matter.

ASCEND BEYOND YOUR ORIGINAL LIMITS

Heroes are not permanently trapped at the rank in which they were summoned.

Through Ascension, a hero can break beyond their original star limit.

Ascension does not require sacrificing duplicate heroes.

Instead, powerful materials obtained from:

• Dungeon progression

• Elite enemies

• Bosses

• World events

• Demon commanders

• High-level challenges

allow experienced heroes to surpass their previous limits.

The strongest heroes are built over time.

DEEP SKILL AND PASSIVE BUILDS

Heroes can learn more abilities than they can actively equip.

Build each hero by choosing which skills and passive abilities define their role.

Higher-rank heroes unlock increasingly complex build possibilities.

A hero can become:

• A defensive protector

• A high-speed attacker

• A critical specialist

• A control unit

• A Mana-focused caster

• A support character

• A hybrid build

• Something completely different through equipment and inherited power

Two heroes with the same origin do not have to become the same fighter.

DEEP EQUIPMENT SYSTEM

Equip heroes with weapons, armor, accessories, rings and necklaces across a deep equipment system.

Equipment can possess:

• Levels

• Stars

• Rarity

• Quality

• Compatibility

• Durability

• History

• Special effects

Heroes can equip gear above their current rank, but they may suffer significant penalties until they are strong enough to use it effectively.

Rare equipment can become part of a hero's identity.

Some items may survive longer than the heroes who once carried them.

FORGING

Gather materials from enemies, bosses and expeditions to create and improve equipment.

The Forge allows you to:

• Craft equipment

• Upgrade weapons and armor

• Repair damaged gear

• Reforge properties

• Add affinities

• Restore valuable equipment

• Purify corrupted items

• Create specialized builds

Craftsmanship itself can influence the final quality of an item.

EXPEDITION RELICS

Relics are not normal equipment.

They affect the entire expedition team and are selected before entering dangerous content.

Relics can specialize your party toward:

• Combat

• Survival

• Exploration

• Defense

• Legacies

• Lineages

• Corruption

• Divine power

Your available relic slots increase as you progress deeper into the world.

LINEAGES

Heroes may possess powerful Lineages that influence how they grow and fight.

Lineages can specialize characters toward different physical, magical, elemental or spiritual paths.

A Lineage represents what a hero is.

A Legacy represents what a hero became.

Combine both systems to create highly specialized heroes.

TAME CREATURES

Not every creature must be killed.

Encounter beasts, magical creatures, spirits and rare entities throughout the world and attempt to tame them.

Raise and develop captured creatures as part of your long-term progression.

Some are common companions.

Others are extremely rare rewards obtained through dangerous encounters and limited opportunities.

Certain powerful creatures — including young dragons — can become some of the most valuable additions to your Sanctuary.

BUILD YOUR SANCTUARY

Your Sanctuary is the center of your progression.

Develop facilities dedicated to:

• Hero summoning

• Barracks management

• Rest and recovery

• Food and preparation

• Forging

• Storage

• Consumables

• Legacies

• Lineages

• Creature taming

• Training

• Expedition planning

• Relics

• Custodian progression

Buildings unlock new functions as they improve.

The Sanctuary is not simply a menu between battles.

It is where wars are prepared before they begin.

BECOME A STRONGER CUSTODIAN

Your heroes are not the only ones who progress.

The Custodian develops their own Authority, improving how efficiently the Sanctuary operates and expanding the strategic options available to your roster.

Your power comes from leadership, preparation and the systems you build around your heroes.

WORLD EVENTS AND SPECIAL CHALLENGES

Participate in changing challenges outside normal dungeon progression.

Face:

• Capture events

• Rare creatures

• Ancient dragons

• World bosses

• Limited encounters

• Seasonal activities

• Special rewards

• High-level challenges

Some events are opportunities.

Others are tests designed specifically for your strongest teams.

RANKED PvP (Coming Soon)

Challenge other players in tactical online battles.

Progress through ranked arenas with different level caps designed to preserve strategic competition while allowing your permanent progression to remain meaningful.

Build formations specifically for PvP and adapt to opponents instead of simply overpowering them with levels.

CROSS-PLATFORM MULTIPLAYER (Coming Soon)

Battle players across supported platforms.

PC and mobile players can enter the same online PvP ecosystem, allowing the community to compete beyond a single device family.

FREE TO PLAY — NO ENERGY SYSTEM

Isekai: Demon King is Free to Play.

There is no traditional energy system that forces you to stop playing because an arbitrary meter reached zero.

Your real limitations are:

• Difficulty

• Risk

• Resources

• Preparation

• Backpack capacity

• Hero survival

• Your own decisions

You can continue playing.

Whether your heroes continue surviving is another question.

ORIGINAL SOUNDTRACK

Enter the world of Isekai: Demon King accompanied by a fully original soundtrack created specifically for the game.

From the solemn atmosphere of the Sanctuary to dangerous expeditions and intense battles, the soundtrack evolves alongside the scale of your journey.

A GAME ABOUT CREATING LEGENDS

Isekai: Demon King is not simply about collecting characters.

It is about remembering them.

The hero who survived when everyone else died.

The weak recruit who eventually became your strongest warrior.

The veteran who carried the same weapon through hundreds of battles.

The hero who inherited an unfinished Legacy and completed it.

The one who defeated an impossible boss.

And the one who died protecting everyone else.

Every hero has a story.



Every expedition carries a risk.



Every victory changes your future.



Every death can become history.

Do not simply collect heroes.

CREATE LEGENDS.