Web Novel/Timeline

Rimuru (Minami Satoru) is the main protagonist of the series, he was a 37 year old bachelor who got stabbed after saving his friend's life and died. He then reincarnated into a slime and met with "Storm Dragon" Veldora, thus, started a new life in a unknown world. The legend of the strongest slime now begins!

Events and Incidents:

 * Formation of the Sovereign Alliance of Nasca Namrium Ulmeria Empire , a.k.a Eastern Empire.
 * Star King Dragon Veldanava married a human woman and had a child together. The child's name is Milim Nava.
 * Veldanava started the Dragon family first by creating the True Dragons : Ice Dragon Velzard, Scorch Dragon Velgrynd and Storm Dragon Veldora.
 * Veldanava passed away and reincarnated as his daughter's pet dragon.
 * Formation of the Dwarves' country - The Armanent Nation Dwargon - by its first king Guran Dwargo (grandfather of Gazelle Dwargo).
 * Birth of the True Demon Lord Guy Crimson who granted the wish of his powerless summoner and destroyed the summoners' enemy nation, and his summoners' country as payment.


 * Birth of the True Demon Lord Milim Nava. Around that time, her pet dragon was killed by some country. In anger, she destroyed that country and awakened as True Demon Lord at the same time as Guy. Unconscious, she fought with Guy.
 * Ramiris was able to stop Milim’s rampage. In doing so she absorbed the magic of demons and the powerful aura of dragons and awakened as Demon Lord.
 * The fight between Guy and Milim resulted in a waste land to the south-west of the continent.
 * Guy, Milim and Ramiris acquainted each other and became the first generation Demon Lords.
 * Guy Crimson and Rudra started their game of forever war between demons and humans.
 * Rudra Nam Ul Nasca became Emperor of the Eastern Empire.
 * Birth of the second generation Demon Lords, including Ruminas Valentine the Vampire Queen, Dino the Fallen Angel, Dagrule the Giant though non of them became True Demon Lords.


 * Event that occured once every 500 years - The war with the Angels.
 * Birth of Dagrule as a True Demon Lord after his rampage in the war.


 * Third generation Demon Lords were born, including Kazaream the Curse Lord (Magic King), Karion the Beast King, Frey the Harpy Queen.


 * The Storm Dragon Veldora rampaged and destroyed the Ruminas's vampire kingdom. The Hero appeared in the midst of it and repelled Veldora. Afterwards, the Hero befriended Ruminas.
 * Ruminas moved her vampire kingdom underground while establishing Holy Kingdom Ruberion in the surface for the refugees and people escaping from war. She was later worshipped as the "God" Ruminas by the Kingdom.
 * The Western Saints Church was established in worship of Ruminas. A Pope, who was a vampire subordinate of Ruminas, was installed.
 * The Hero defeated Veldora 300 years ago and used Endless Prison to seal him in the cave.
 * Leon Cromwell and Chloe O'Bell were summoned to this world, Chloe was then summoned elsewhere soon after.
 * The Magic King (Curse Lord) Kazaream was beaten by Leon.
 * Leon Cromwell awoke as a Demon Lord as well as a True Hero.
 * Kazaream was secretly revived.
 * Clayman the Marionette Master became a Demon Lord to replace Kazaream.
 * The Ten Great Demon Lords was formed.
 * Leon summoned Shizue Izawa to this world and implanted fire spirit Ifrit inside her to save and control her.
 * The Hero launched an attack on Leon, freeing Shizue in the process.
 * The Hero went into slumber underground of Holy Kingdom Ruberion, watched over by Ruminas.
 * Kazaream summomed Yuuki Kagurazaka into this world. Yuuki enslaved Kazaream using his Unique Skill.
 * Hinata Sakaguchi was summoned into this world.
 * Yuuki and Hinata came under the guidance of Shizue. Hinata later left Shizue after learning everything from her.
 * Hinata joined the Western Saints Church and soon got promoted to Captain of the Holy Knights/Knight Templars.
 * Yuuki formed the Freedom Association and became its Guild Master.
 * Cerberus underground organisation was formed with the collaboration between Yuuki and Damrada.
 * Leon got in contact with Yuuki and employed him for summoning Otherworlders in order to look for Chloe.
 * Chloe O'Bell was summoned by Yuuki from her first summoning to this world. 4 more Otherworlder children were summoned around the same time as she was summoned.


 * The "Lake Shore Dyed in Scarlet" incident. Summoned demon consuming a princess and destroying the small kingdom. The demon was then subjugated by the Eastern Empire.

Empowerment Arc

 * Minami Satoru's Reincarnation into a slime born in the Cave of the Seal.
 * Slime "Minami Satoru" met with Storm Dragon Veldora and they named each other Rimuru Tempest and Veldora Tempest respectively.


 * The disappearance of the Storm Dragon Veldora.


 * A village of Goblins was attacked by a pack of Fang Wolves.


 * The village's Goblins met Rimuru.


 * Rimuru saves the Goblins and giving names to both Goblins and Fang Wolves, thus, enabling them to go through evolution. Goblins evolved into Hobgoblins while Fang Wolves evolved into Storm Fang Wolves.
 * Rimuru journeyed to Dwarf Kingdom with the Hobgoblins and Storm Fang Wolves.
 * Rimuru got involved into an incident with the Dwarf offical Bester . The incidents ended with Rimuru and 4 Dwarves exiled from the Dwarf Kingdom.
 * Rimuru recruited 4 Dwarves - Kaijin, Garm , Mild and Doldo - to his cause to help build the Hobgoblins' village.
 * More Goblins' villages joined Rimuru's village.
 * The start of the contruction of Hobgoblins' village that soon to become the capital of Tempest in the near future.
 * B-ranks adventurer party of Cabal, Ellen and Gido along with A-rank Shizue Izawa met with Rimuru Tempest while journeying inside the Great Jura Forest.
 * Otherworlder Shizue Izawa passed away and then absorbed by Rimuru Tempest. Following this, Rimuru acquired human form.
 * Cabal's party got acquainted with Rimuru's village, setting up the premise for humans' interactions with Tempest in the near future.

Forest Disturbance Arc

 * The Orc Lord/King was born among the Orcs.
 * Orcs, led by the Orc Lord/King, rampaged throughout the Great Jura Forest, wiping out monsters along the way, one of the victims are the Ogres' village.
 * Rimuru met 6 Ogres, who were the last remaining survivors from the Ogres' village attacked by the Orcs, while they were on the run.
 * Rimuru recruited the Ogres to be his subordinates and named them accordingly: Benimaru, Shuna, Souei, Shion, Hakurou and Kurobee . The 6 Ogres evolved into Onis.
 * Lizardmen sent out Gabil, the Lizardmen Head's son, to recruit war potential around the Great Jura Forest to counter the approaching Orcs force.
 * Rimuru had an audience with the Lizardmen led by Gabil. The negotiation for alliance ended in failure due to Gabil's foolishness.
 * Rimuru sent the Oni Souei to form an alliance with the Lizardmen.
 * Gabil's troop collected Goblins' villages from the Great Jura Forest by force. He then led a coup to topple his father and claimed the position of Lizardmen Head and declared war against the Orcs.
 * Gabil the Lizardman led the force of the Lizardmen and Goblins to engage the Orcs.
 * Rimuru and his forces set out as reinforments for the Lizardmen.
 * Rimuru's force annihilated a portion of the Orcs Army with no casualties.
 * Rimuru engaged in battle with the Orc Lord - Orc Disaster.
 * The meeting of 4 Demon Lords in viewing the Orc invasion to witness the birth of a new Demon Lord. The meeting was initiated by a Devil named Gelmudo.
 * The battle between Rimuru and Orc Disaster was interrupted by Gelmudo. Gelmudo got beaten up by Rimuru and then eaten by Orc Disaster. As a result, Orc Disaster gained an ego and evolved into a Pseudo-Demon Lord.
 * Rimuru defeated the Orc Disaster singlehandledly, ending the Orcs' rampage.


 * Rimuru recruited the remaining Orcs into his force.
 * The remaining Goblins' villages joined Rimuru.
 * Formation of the Great Jura Forest Coalition.
 * Gabil got exiled from the Lizardmen and then joined Tempest along with his 100 loyal followers. His sister and 4 other Lizardmen also joined Tempest under the guidance of Souei. The Lizardmen, after getting named by Rimuru, evolved into Dragonewts.
 * The founding of the Monster country Tempest: Rimuru's village developed further into a town/city thanks to the Orcs. Formation of Tempest military : Hiryuu, Shadow Squad , Green Numbers/Corps , Yellow Numbers/Corps.

Life in the Royal Capital Arc

 * The Dwarf King Gazelle Dwargo   visited Rimuru's city and decided to recognize it as a country while promising future alliance and cooperation. The Dwarf Bester was brought to Tempest by Dwargo to work under Rimuru as a researcher.
 * Rimuru's city and the Great Jura Forest Coalition was established as a country and named Tempest.
 * Demon Lords' spies entered Tempest to investigate.
 * Milim befriended Rimuru and stayed in Tempest for several days.
 * Farmas Kingdom's Frontier Garrison encountered Tempest and decided to get aids from Tempest to strengthen their garrison.
 * Rimuru journeyed to the human countries, starting with Brumund Kingdom.
 * Milim Nava fell under Demon Lord Clayman's control and attacked Karion's country - Beast Kingdom Yuurazania. The attack resulted in both the castle Morotomo and the sacred mountain behind it destroyed due to Milim's destructive power.
 * Rimuru joined the Freedom Association.
 * Through the Freedom Association, Rimuru got acquainted with Garde Myourmiles, opening the trading routes and businesses between Tempest and the human countries.
 * Rimuru journeyed to Ingracia Kingdom to get to Freedrom Association headquarters and meet with Kagurazaka Yuuki.
 * Rimuru met the five summoned otherworlder children and became their teacher.
 * Rimuru and the children journeyed to Ulgrasia Republic to enter the Dwelling of the Spirits. There, Rimuru met and got acquainted with the Fairy Queen Ramiris. To compensate for destroying the Golem Guardian of the Dwelling, Rimuru created the demon Beretta to serve Ramiris.
 * Rimuru implanted spirits into the five children, saving them from dying due to overflowing magical energy within their bodies. This included placing Chloe's time travelling spirit into her child form's body.
 * Rimuru bid farewell to the children after getting the news of Tempest under attack.

Birth of a Demon Lord Arc

 * Blood Shadows killed several citizens of Tempest including the Oni Shion.
 * Rimuru battled Hinata Sakaguchi as she interrupted him on his way to Tempest. The battle ended with Rimuru safely retreating. Rimuru then arrived at Tempest only to discover the tragedy.


 * Farmas Kingdom's Subjugation/Invasion force marched towards Tempest with supports from the Western Saints Church.


 * Rimuru completely massacred the Subjugation/Invasion Army of Farmas Kingdom.


 * Rimuru summoned an Arch Demon and his two Greater Demon subordinates to chase down the survivors. The only survivor from the Subjugation/Invasion Army is the King of Farmas Kingdom.
 * Rimuru evolved and awakened into a True Demon Lord through using the 10,000 souls of the Subjugation/Invasion Army.


 * Harvest Festival of Tempest: Revival of the Tempest citizens killed by the Blood Shadows along with Shion, Evolution of the Onis into Fair Onis and Dark/Evil Oni, Strengthening of the every monsters in Tempest under Rimuru's rule.
 * Formation of the Yomigaeri.
 * Rimuru named the Arch Demon he summoned Diablo - Diablo evolved into a Demon Noble/Demon Duke.
 * The reappearance of Storm Dragon Veldora: Veldora was released by Rimuru after unsealing the Endless Prison.
 * Conference between Tempest, the human countries and the Dwarf Kingdom: establishment of alliances and cooperation. Among the human countries, there are Brumund Kingdom and Sorcerer's Dynasty Sarion.
 * The Fairy Queen Ramiris intruded upon the Conference to warn Rimiru of Tempest's impending doom due to the Walpurgis Banquet of the Demon Lords.
 * The Walpurgis Banquet - the meeting of the Demon Lords with all Demon Lords attended it, including Rimuru Tempest.


 * At the meeting, Clayman's plan to destroy Tempest was exposed due to collusion of Demon Lords Milim Nava, Frey and Karion. Rimuru then killed him.


 * Rimuru was accepted into the circle of Demon Lords and granted the domain of the entire Great Jura Forest.
 * Karion and Frey resigned from the seats of Demon Lords to become Milim's subordinates.
 * The Demon Lords decided on renaming the circle with Rimuru naming the current Demon Lords - Eight Star(Octogram) Demon Lords.

Saint Demon Confrontation Arc

 * Farmas Kingdom entered into a civil war due to failure in subjugating Tempest.
 * The Western Saints Church received words of the failure in subjugating Tempest and Rimuru's ascension.
 * Rimuru returned to Tempest and prepared for the invasion of the Western Saints Church.
 * The Western Saints Church dispatched 100 Holy Knights/Knight Templars under the command of Knight Captain Hinata Sakaguchi to subjugate Tempest
 * Demon Lord Ruminas Valentine returned to her dwelling only to discover her "precious" had been stolen. In rage, she awakened her Ultimate Skill.
 * Tempest battled the Holy Knights/Knight Templars. Tempest won the battle with zero casualties on both sides by neutralizing the Knights.
 * Rimuru defeated Hinata. They reconciled afterwards.
 * The Holy Knights/Knight Templars surrenderred and negotiated with Tempest in compensation and future relations.
 * Tempest was declared a country of Demi-Humans and accepted by the Church.

Founding the Demon Capital Arc

 * Tempest sent out invitations to its allies regarding Tempest Tournament.
 * Rimuru officially employed Garde Myourmiles as his minister and Department Head of the Departments of Business and Publicizing.
 * Construction of Tempest's Arena and preparation for the Tournament.
 * Rimuru employed Ramiris to construct the Underground Labyrinth as an attraction for Tempest.
 * Inhabitants of the Great Jura Forest paid their repects to their new ruler - Demon Lord Rimuru Tempest.
 * The Elves pled with Rimuru to rescue their brethens that were captured and enslaved by the underworld organization Cerberus . Rimuru accepted the request and rescued all the demi-human slaves from Cerberus.
 * Rimuru met Damrada - an Executive of Cerberus.
 * Rimuru picked up and named some monsters for the Labyrinth. These monsters included Insect monsters Zegion and Apito, fox monster Kumara and 9 other beast monsters as well as undead monsters Ghost King Adalman and Ghost Paladin Albert.
 * Ramiris' Labyrinth was completed with the collaboration of Rimuru, Veldora, Milim and Ramiris herself.
 * Invitees of the Tournament as well as visitors flocked to Tempest in large amount for the Tournament.
 * Dagrule sent his three sons to Tempest to learn.
 * Tempest Tournament was held.
 * The Gozu and Mezu monster tribes' dispute was solved during the Tournament with the battle between their respective representatives Gozurl and Mezurl. After the Tournament, Rimuru employed them as boss monsters inside the Labyrinth.
 * Rimuru got acquainted with Sorcerer's Dynasty Sarion's Empress Elumeshia Elure Sarion during the Tournament through the introduction of Duke Elalude of Sarion, Ellen' s father. With this meeting, they promised further alliance and cooperation in developing technology.
 * "Hero" Honjou Masayuki - another Otherworlder - joined Tournament only to gave up halfway. Afterwards, he was employed by Rimuru as observer on developing and adjusting the Labyrinth as well as an mediator with the adventurers.


 * The Oni Benimaru became the champion of the tournament after winning the final round.
 * The Underground Labyrinth was officially opened, with its debut tested by a Labyrinth Exploration Party.
 * Momiji - the Tengu Elder's granddaughter - proposed to Benimaru after witnessing his valor in the Tournament.
 * The Dryads and Treants reunited with their Queen Ramiris and became her subordinates. An area was established for them and the Elves inside the Labyrinth - formation of the Underground Labyrinth City.
 * Tempest's reputation spead out all over the world after the Tournament and the opening of the Labyrinth.


 * Rimuru created avatars based on the Homunculus to enjoy the dungeon with Veldora, Ramiris and Milim.

Demon Lords’ Gambit Arc

 * Hinata resigned as the Captain of the Holy Knights/Knight Templars and cut all ties with the Holy Kingdom Ruberion.
 * Hinata decided to go to the Ingrasia Kingdom to rescue the 5 summoned children from Rimuru's story and as per request of her teacher Shizue.
 * Chloe O'Bell got erased from existence and the children's memories.
 * Yuuki ambushed Hinata with the Hero retrieved from Demon Lord Ruminas Valentine.
 * Hinate battled the Hero. The battle ended with Hinata killed by the Hero. At the same time, Hinata awakened as a True Hero.
 * Fritz, who journeyed with Hinata, managed to escape with the children and Hinate's coprse from Yuuki's ambush. They then returned to the Western Saints Church.
 * While the Western Saints Church members moaned Hinata's death, Demon Lord Ruminas Valentine revealed herself as the ruler of the Holy Kingdom Ruberion as well as the God Ruminas - who the Church worshipped.
 * The Hero visited the Church and revealed herself to be Chloe O'Bell from the future that merged with Hinata's soul.
 * Hinata's soul left Chloe O'Bell's body and completed the cycle of time travelling. (See the Diagram Below)
 * Ruminas used her Ultimate Skill to revive Hinata.
 * Chloe revealed the story of the alternate future of chaos spreading around the world due to Yuuki as well as her current condition under Yuuki's control. Afterwards, she left to return to Yuuki's side.
 * Yuuki escaped Ingracia Kingdom with his trusted followers, leaving behind the Freedom Association.
 * Hinata and the remaining children departed to Tempest to entrust their care to Rimuru.
 * Ruminas and Hinata arrived at Tempest to propose an alliance with Tempest to oppose Yuuki. Rimuru invited Fuze - Guild Master of the Brumund Freedom Association HQ - along to discuss the matter as Rimuru requested him to investigate Yuuki. An Alliance of 3 Kingdoms - Tempest, Holy Kingdom Ruberion, Brumund Kingdom - was formed.
 * The Alliance launched the Yuuki Subjugation Raid though it ended in failure due to Yuuki already escaped.
 * Freedom Association was dissolved and reformed into Freedom Arbitration Commitee with Hinata as the chairman.
 * Demon Lord Leon Cromwell invited Rimuru to his territory - the magic city El Dorado.
 * Leon and Rimuru discussed matters regarding Yuuki. They reached the conclusion of an alliance in the end.
 * Yuuki was discovered escaping to the Eastern Empire through climbing the mountain range loomling over the Dwarf Kingdom.
 * Yuuki versus Leon Battle: Leon launced an attack on Yuuki by himself after discovering his location.
 * During the battle, Yuuki awakened his Ultimate Skill and revived the Chaos Dragon - Milim's pet - and then killed it again to absorb its energy to strenthen himself.
 * The battle ended with everyone of Yuuki's followers dead except Yuuki himself and Kagari - a body possessed former Demon Lord Kazaream while Leon's 4 followers remained alive with one of them - Black Knight Claude -  converted to Yuuki's side due to Yuuki's Skill and 1 dead. Unbeknownst to Yuuki, Claude had been released thanks to Chloe and became Leon's spy in observing Yuuki.
 * Yuuki and Kagari managed to escape along with Claude and Chloe.
 * The battle also left a crater in the mountain range where the fight took place while alerting the Dwarf Kingdom nearby at the same time.
 * Rimuru and Ruminas arrived as reinforcements with Rimuru' force fixed the aftermath of the battle while Ruminas revived the dead knight follower of Leon. Rimuru kept the soul of the Chaos Dragon for its revival.
 * Yuuki successfully escaped and arrived to the Eastern Empire.

Empire’s Invasion Arc

 * Rimuru revived the Chaos Dragon as a small dragon and gave it back Milim - the reunion of Milim and her pet dragon Gaia.
 * Technology cooperation between Tempest, Sarion, Ruberion and Dwargon began.
 * Railroads established throughout the Great Jura Forest and connected Tempest with Dwargon.
 * Yuuki climbed ranks within the Eastern Empire and became the head of Mixed Corps within the Empire.
 * Rimuru was invited to the conference to meet and negotiate with the Conference Coalition, a.k.a the Council, in response to the movement of the Eastern Empire. The negotiation initially broke down due to the Council's selfishness but Rimuru intimidated them and forced the negotiation in Tempest's favor in the end.
 * As a result of the negotiation, the Council's HQ and the Freedom Arbitration Commitee's HQ were relocated to Tempest.
 * Dino visited Tempest and requested to be employed. Rimuru employed him as Ramiris's assistant.
 * Reorganization of Tempest military. Formation of First Corps, Second Corps and Third Corps led by Gobuta/Ranga, Gerudo and Gabil respectively.
 * Birth of the Black Numbers/Corps by Diablo.
 * Tempest's First Corps engaged in Battle Eastern Empire's Armored Corps tanks
 * Tempest's Third Corps engaged in Battle Eastern Empire's Armored Corps airships
 * Labyrinth Monsters engaged in Battle Eastern Empire's Armored Corps Labyrinth Subjugation Force
 * Tempest's Second Corps, Fourth Corps and Yomigaeri engaged in Battle Eastern Empire's Armord Corps Tempest Captial Subjugation Force

Ryuma Clash Arc/Clash of Dragons and Demons Arc

 * Storm Dragon Veldora engaged in battle with Scorching Dragon Velgrynd and Eastern Empire - Veldora lost due to being shot by Kondou Tatsuya, sealed by Magic Cancellers and controlled by Rudra's Ultimate Skill.
 * Rimuru Tempest and Wisdom Lord Raphael engaged in battle with Scorching Dragon Velgrynd and Storm Dragon Veldora - who was under Rudra's control.