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 Life and dying he reincarnated into a slime And met with "Storm Dragon" Veldora start  a new life in a unknown world The legend of the strongest slime now begins!

Events and incidents

 * 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.


 * Birth of the second generation.


 * Event that occurs once every 500 years. The war with the Angels.


 * Three new Demon Lords were born.


 * The storm dragon destroying the vampire kingdom.
 * The Magic King (Curse Lord) Kazaream was beaten by Leon.


 * Hero defeated Veldora300 years ago and using Endless Prison to Sealing he in the cave


 * The Lake Shore Dyed in Scarlet incident. Summoned demon consuming a princess and destroying the small kingdom.


 * Rimuru Resurrection


 * The disappearance of the "Storm Dragon" Veldora


 * Goblins are attacked by a pack of Fang Wolves.


 * Goblins meet Rimuru


 * Rimuru saves the Goblins and giving names to both Goblins and Fang Wolves Evolution.


 * Rimuru meet the ogres


 * The Orcs invasion Rimuru killing the orcs disaster


 * The founding of the Monster country Tempest


 * Blood shadow killing citizens of Tempest


 * Farmas Kingdom and blood shadow subjugation march towards Tempest


 * Rimuru completely massacre the subjugation Army.


 * Rimuru summoned an Archdemon and his two greater demon subordinates. The only survivor from the subjugation army is the king.


 * Harvest Festival


 * Downfall of Falmas Kingdom


 * Rimuru goes to the meeting of Demon Lord the killing Clayman


 * Rimuru naming of the current Demon Lords - Eight Star(Octogram) Demon Lords


 * The elf kidnapping incident bye A noble and Cerberus


 * Tempest tournament and building of the labyrinth


 * Benimaru as the champion of the tournament


 * Labyrinth Exploration Party


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


 * Hinata resigned as the head of the imperial guard and cut all ties with the Holy Empire Ruberion and Hinata decided to go to the Ingrasia Kingdom

Birth of a Demon Lord Arc
By offering the corpses of the Blood Shadows and the 15000 human soldiers, Rimuru summoned an Archdemon and his two greater demon subordinates. Using the corpses they were successfully able to materialize. He ordered them to capture the the three escaping Blood Shadows, and bring them to Ranga.The secret revival art was lacking the necessary energy. so the Archdemon offered his two subordinates. They were delighted to be of use to Rimuru. Hence, when Rimuru awaked he was grateful and allowed the Archdemon to become one of his comrades. When Rimuru found out he didn’t have a name he named him Diablo. And told him to become his guardian deity. A black cocoon enveloped his body creating a perfect evolution posture.

Saint Demon Confrontation Arc
It is later revealed that he is in fact not a Archdemon, but a Demon Duke. "I am not an Arch demon like you had previously said, but a Demon Duke." He reveals while battling a Templar Knight. A Demon Duke is a legendary existence. It is supposedly ranked higher than a self-proclaimed Demon Lord. There has been no other Demon Duke summonings previously documented.