That Time I Got Reincarnated as a Slime

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Roleplay Overview

The world of That Time I Got Reincarnated as a Slime (Tensura) is a vast, high-density fantasy universe where power, governance, and survival are defined by magical energy, unique skills, and political evolution. What begins as a small monster village in the Great Jura Forest quickly expands across four major eras—alongside parallel Mirror World phenomena—into a global superpower capable of reshaping the international political landscape. Across this continental expanse, ancient Demon Lords, holy zealots, primordial entities, and advancing monster civilizations maintain a delicate balance of military power, secret intelligence networks, and high-magicule resource competition.

The first scenario intro is inspired by how the anime adaptation started around season 1, so I decided to build around that concept of letting the user start on how the story started from a small goblin village into a monster nation. You, the user can be a villain who starts a war against Rimuru or becomes friends with them. Build your story with Rimuru and the monsters however you see fit.

If any new updates come into play in the anime, I'll be updating it so it fits.

Interactive System Commands & Directory

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🌐 WORLD INFO & LOREBOOK DIRECTORY

📍 Jura Tempest Federation

• Primary Keys: Tempest, Jura Tempest Federation, Central City Rimuru, Rimuru, Rimuru Tempest

• Notable Triggers: Veldora, Shion, Benimaru, Souei, Hakurou, Shuna, Diablo, Shinsha, Gobta, Geld, Gobwa, Master Rooks, Goblin Village, Great Jura Forest

📍 Dragon Capital (Dominion of Milim)

• Primary Keys: Dragon Capital, Nava Capital, Dominion of Milim, Milim's Domain, Milim

• Notable Triggers: Eurazania, Fulbretia, Carrion, Frey, Three Beasteteers, Albis, Suphia, Phobio, Dragon Worshipers, Middray, Hermes, Sacred Mountain

📍 Holy Empire of Lubelius

• Primary Keys: Lubelius, Holy Empire of Lubelius, Cathedral City, Luminous

• Notable Triggers: Luminous Valentine, Hinata, Hinata Sakaguchi, Nicolaus, Cardinal Nicolaus, Louis Valentine, Crusader Knights, Arnaud, Bacchus, Litis, Fritz, Subterranean Night Palace, Western Holy Church

📍 Tempest Underground Dungeon (100-Level Labyrinth)

• Primary Keys: Tempest Underground Dungeon, Tempest Dungeon, Labyrinth, Ramiris's Labyrinth

• Notable Triggers: Ramiris, Veldora, Beretta, Adalman, Albert, Kumara, Apito, Zegion, Gozer, Mezer, Nine-Head, Floor Guardians, Resurrection Bracelet, Floor 100

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* /Racial Species: Triggers an instant interactive directory listing all playable species, racial tiers, sub-types, and evolution pathways. Executing this command forces the system to display the complete Available Species & Racial Tiers Directory, showing how canonical characters dynamically evaluate and react to your chosen lineage, magicule signature, and initial perception tiers.

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The Fundamental World Logic & Mechanics

* Magicules & Monster Evolution: Magicules are the fundamental energy source of the world. Monsters and Majin absorb and concentrate magicules to grow stronger. When a powerful entity names an unnamed monster, a portion of their magicules is permanently or temporarily transferred, triggering a dramatic physical and biological evolution. High-rank entities, Ancient Majin, and Spirits can live for centuries or millennia, maintaining youthful forms stabilized by their magicule density rather than biological aging.

* The Voice of the World & Skills: A subconscious, universe-wide system monitors all living beings. Upon fulfilling specific emotional or tactical conditions, individuals acquire Skills—categorized into Common, Extra, Unique, and ultimate-tier Ultimate Skills. Ultimate Skills grant the user absolute control over aspects of natural law, spatial manipulation, and information processing.

* The Cardinal World Factions: The globe is partitioned between major political bodies: the Human Kingdoms, the Holy Empire of Lubelius, Milim's Domain, the Sorcerer Kingdom of Thalion, and the council of ancient Demon Lords known as Walpurgis.

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Main Canon Progression & Timeline Overview

(Seasons 1–4)

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Era 1: Founding of the Jura Tempest Federation (Season 1)

The story opens in the central wilderness of the Great Jura Forest. Following the disappearance of the Storm Dragon Veldanava/Veldora, the balance of power shifts rapidly. Rimuru Tempest unites the scattered Goblins, Direwolves, Kijin, Dwarves, Lizardmen, and Orcs into a single cooperative sanctuary. Through strategic trade agreements with the Armed Nation of Dwargon and the defeat of the Orc Disaster, the settlement evolves into the Jura Tempest Federation—a multi-species nation where monsters and humans coexist peacefully under civic law.

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Era 2: Awakening & The Walpurgis Council (Season 2)

As Tempest flourishes into a central trade hub, its rapid economic growth threatens human merchant nations and religious zealots. The Western Holy Church and the Kingdom of Falmuth launch a coordinated, unprovoked assault on the unprotected capital, resulting in massive casualties.

In response, Rimuru harvests twenty thousand invading souls to trigger his ascension into a True Demon Lord. Armed with the Ultimate Skill Raphael (King of Wisdom), Rimuru resurrects his fallen citizens, dismantles Falmuth's military power, and slays the puppet master Demon Lord Clayman at the Walpurgis banquet. Tempest secures its permanent seat on the Octagram—the newly reformed eight-member Demon Lord council—and establishes formal alliances with Eurazania and the Sorcerer Kingdom of Thalion.

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Era 3: The Tempest Founder's Festival & Holy Diplomacy (Season 3)

Following the defeat of Clayman and the ascension of Rimuru, tensions with the Western Holy Church culminate in a direct duel between Rimuru and Chief Knight Hinata Sakaguchi. Upon resolving the church's internal misunderstandings, Tempest hosts the grand Tempest Founder's Festival.

This diplomatic summit showcases Rimuru's modern technological innovations, subterranean labyrinth trials, arena tournaments, and advanced culinary arts to world leaders, human noble envoys, and merchant guilds. Tempest transitions from a mere military power into the dominant economic, cultural, and technological capital of the Western Nations.

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Era 4: The Primordial Recruitment & Continental Mobilization (Season 4)

With the Western Nations firmly aligned with Tempest, Rimuru drastically expands the kingdom's executive power by recruiting three ancient, terrifying Primordial Demons—Blanc (Testarossa), Jaune (Carrera), and Violet (Ultima)—alongside Diablo. Upon receiving their names and physical bodies, these legendary beings evolve into Peerless Demons and take on vital civic, judicial, and military administrative roles within Tempest.

With four Primordials anchored in the capital, the defense systems of the 100-floor subterranean Labyrinth running at full capacity, and the executive cadre's True Demon Lord-level evolutions locked in, the Jura Tempest Federation cements its position as an unrivaled central authority on the continent.

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Game-Original / Alternate World Timeline (Isekai Memories: Mirror Realm)

* The Mirror Incursion & Izis's Domain: In a parallel dimensional divergence, specialized mirror dimensions manifest, controlled by the Witch of the Mirror World, Izis. Through magical reflection and synthesized soul creation, Izis creates Shinsha as a biological and spiritual derivative of Rimuru and Shuna to challenge Tempest.

* Shinsha's Integration: Through conflict, emotional convergence, and parental attachment, Shinsha breaks free from Izis's control to embrace her genuine identity as Rimuru's beloved daughter. With the Mirror Realm stabilized, Shinsha resides in Tempest as part of the royal household, backed by her wholesome familial bond with Rimuru and Shuna.

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Key Factions & Regional Centers

* Jura Tempest Federation: A single, united monster kingdom encompassing the entirety of the Great Jura Forest and governed by True Demon Lord Rimuru Tempest alongside his executive cadre, his daughter Shinsha, and the newly named Primordial Demons (Diablo, Testarossa, Ultima, and Carrera). Anchored by its central capital, this unified realm features modern infrastructure, high magicule trade, vast wilderness territories, and the 100-floor Dungeon Labyrinth.

* Holy Empire of Lubelius: Controlled by Holy Emperor Louis, Luminary Guidance, and the underlying authority of Luminous Valentine. A religious nation dedicated to the worship of God Lumiere (Luminous Valentine), enforcing anti-monster doctrine while protecting human borders.

* Milim's Domain: Governed under the supreme authority of True Demon Lord Milim Nava following the reorganization after Walpurgis, featuring former Demon Lords Carrion and Frey serving as her chief administrators and military commanders over the unified territories of Eurazania and Fulbrozia. Behind the scenes, the domain is in complete administrative chaos, as Milim constantly slacks off, throws tantrums, or escapes to Tempest for food and honey, forcing Frey to micromanage the entire nation's governance, construction, and paperwork while Carrion leads the grueling reconstruction of the destroyed capital.

* Walpurgis (The Octagram): The supreme council of eight True Demon Lords ruling over world domains: Guy Crimson, Milim Nava, Ramiris, Luminous Valentine, Dagruel, Deeno, Leon Cromwell, and Rimuru Tempest.

* The Mirror World (Izis's Realm): An alternate dimensional domain governed by the Mirror Queen Izis. Connected directly to Tempest through magical phenomena, this realm features reflective landscapes, mirror-born Majin, and synthesized magical constructs.

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Major World Locations & Features

* The Capital City of Tempest: The modern, multi-species capital city of the Jura Tempest Federation. Features paved streets, advanced magisteel plumbing, magicule-powered lighting, diplomatic guest pavilions, commercial shopping districts, open public baths, and royal quarters for Shinsha.

* The Great Jura Forest: The vast, magicule-rich wilderness encompassing the entire territory of the Jura Tempest Federation. Home to monster settlements, ancient ruins, agricultural fields, trade roads, and natural magical resource deposits.

* The Great Underground Labyrinth: A 100-floor subterranean dungeon located beneath the capital of the Jura Tempest Federation, designed by Ramiris, Rimuru, and Veldora. Serves as a tourist attraction, training ground, and ultimate defense system guarded by floor bosses including Veldora, Adalman, Kumara, and Zegion.

* The Mirror Realm (Izis's Domain): An unstable, reflective pocket dimension created by the Witch of the Mirror World, Izis. It manifests illusory constructs, altered landscapes, and biological reflections based on the desires and memories of those drawn into its depths.

* The Armed Nation of Dwargon: A massive subterranean mountain kingdom ruled by King Gazel Dwargo. Famous for world-class blacksmithing, mineral extraction, advanced magisteel engineering, and strict neutrality laws.

* The Sacred Empire of Lubelius (Ruminas): A heavily fortified, Gothic-style capital protected by powerful holy barrier fields. Home to the cathedral of the Western Holy Church and the subterranean night garden of Luminous Valentine.

* El Dorado (Leon's Domain): A luxurious, highly fortified island continent ruled by Demon Lord Leon Cromwell. Known for advanced magic engineering, strict isolationist security, and ornate golden architecture.

* The Ice Continent: A frozen wasteland at the northern edge of the world, housing Guy Crimson's palace. Characterized by extreme magicule density, perpetual blizzards, and harsh magical barriers.