Anyone following “That Time I Got Reincarnated as a Slime” (Tensei Shitara Slime Datta Ken) knows the excitement doesn’t stop at city-building. In Season 4 (covering Light Novel
Anyone following “That Time I Got Reincarnated as a Slime” (Tensei Shitara Slime Datta Ken) knows the excitement doesn’t stop at city-building. In Season 4 (covering Light Novel Volume 10 onwards), the scale expands to a world-war level of politics and spiritual mind games. Here are 4 major turning points that shake the slime world!
After Tempest’s grand opening festival, the city’s economy flourished. This caught the eye of “Mariabell” of the Rosso family, wielder of the unique skill “Greed,” who secretly manipulated the Western Council’s economy. She tried every means to eliminate Rimuru — seduction, mind control, and awakening a berserk dragon — but ultimately failed and was captured by “Yuuki Kagurazaka.” Rimuru used this opportunity to send his subordinates to infiltrate and reform the Western Council.
2. The Primordial Demon Incarnation: When the Three Demon Girls Entered the Story
In Season 4, the three Primordial Demons — Testarossa, Ultima, and Carrera — were officially given “incarnation” bodies by Rimuru, becoming powerful executives of Tempest. These three demon girls possess destructive power at an apocalyptic level. Their debut in the story signals that Tempest’s military power has truly surpassed any human nation.
3. The Eastern Empire’s Great War Declaration
The Eastern Empire, led by the Emperor who possesses divine-level power, officially declared war against Tempest — the biggest conflict in TenSura’s history. The Empire deployed over one million soldiers with advanced magical weaponry. This became the ultimate test for Rimuru and Tempest’s true strength.
4. The Result: Rimuru’s Evolution and New Resolve
After the great war, Rimuru doesn’t just emerge victorious — he evolves further, unlocking new abilities and gaining deeper understanding of his role as a ruler. Season 4 is a turning point where Rimuru transitions from a “good-natured slime” to a true ruler who must make difficult decisions for the sake of his people. If you want more details, we highly recommend reading the Light Novel from Volume 10 onwards!
