That Time I Got Reincarnated as a Slime Season 4 Episode 2: The Dungeon Evolves

Masayuki Honjou's party faces a formidable Ogre Lord on the Labyrinth's thirtieth floor. His companions, Jinrai and Bernie, fight with trained precision, but Masayuki himself seems to contribute little. A clumsy trip sends his sword flying, miraculously striking the Ogre Lord's precise weak spot, ending the battle. His teammates, convinced they witnessed a legendary technique, solidify his undeserved reputation.

News of Masayuki's latest triumph sweeps through Rimuru City, transforming him into a living legend. Street vendors hawk Masayuki-themed souvenirs, and children play, mimicking his 'moves.' This burgeoning fame translates directly into economic prosperity for the Labyrinth and the city, drawing more adventurers and money. Rimuru Tempest and Myourmile acknowledge Masayuki's unexpected but undeniable impact on their enterprise.

The celebratory mood shifts with the arrival of Ramiris and Veldora Tempest, bearing news of Team Ryokuran, a new threat to the Labyrinth's integrity. These challengers are clearing floors with alarming speed, using what Rimuru Tempest discerns, with Raphael's help, to be an Elementalor's ability to coerce local spirits for information. Meanwhile, Myourmile confirms the Labyrinth's financial reports, revealing an astronomical profit that even impresses Veldora. The contrast between the looming threat and immense success is striking.

Rimuru Tempest reveals the true purpose of the Labyrinth's lowest floors. Beyond adventurer challenges, floors 95 through 100 house advanced research facilities for Gabil, Bester, Ramiris, and Rimuru himself. Here, shielded from external eyes, they develop cutting-edge technologies. These innovations range from magicule energy harvesting to the creation of artificial vessels, pushing the boundaries of what magic can achieve.

Rimuru Tempest returns to his lab, only to find Shuna and Shion worried about his intense work ethic. They bring him food, a brief moment of warmth before Myourmile bursts in with urgent news. Team Ryokuran is making an aggressive push on the 30th floor. Watching the live feed, Rimuru observes their highly coordinated, almost mercenary tactics, cycling fresh fighters.

Ramiris explains Team Ryokuran's 'cheap' tactics, which involve using return whistles and save points to constantly refresh their party. This transforms them into an effective hundred-person army rather than a single group. Myourmile identifies them as 'Belt,' a mercenary organization potentially backed by Ingrassia. Rimuru Tempest worries for Gozurl and Mezurl on floor 50 and remembers the damage Hinata's prior raid inflicted on floors 60 and above, leaving them boss-less.

A flashback reveals Hinata Sakaguchi's brutal efficiency during her 'training' raid. She effortlessly obliterates the Elemental Colossus on the 70th floor, proving her power is far beyond typical Labyrinth bosses. Her cold, surgical advance reaches the 90th floor in a single, unimpeded run. Veldora Tempest later recounts his duel with Hinata on the 100th floor, admitting she landed a genuinely painful hit, a feat that deeply impressed him.

Rimuru Tempest, irritated by Hinata's damage and her audacious request for prize money, resolves to fix the Labyrinth himself. He finds Adalman on the 60th floor consumed by shame from his loss to the Holy Knights. Rimuru reassures Adalman, explaining the elemental mismatch, then bestows upon him and Alberto the 'Holy-Demonic Reversal' technique. This gift allows Adalman to wield holy magic, transforming his despair into overwhelming gratitude and renewed devotion.

Adalman tests his new 'Holy Ray' with devastating effect, the magic amplified by his vast magicule capacity, inspiring awe at his own newfound power. Afterward, Rimuru Tempest, Veldora Tempest, and Ramiris collaborate to redesign the boss rooms, giving Adalman a fittingly macabre throne room on the 70th floor. Veldora offers 'boss-like' aesthetic flourishes, while Ramiris ensures spatial integration, pleasing Adalman immensely.

Ramiris openly mourns the destruction of her custom-built Elemental Colossus, lamenting that her greatest creation is gone forever. Rimuru Tempest calms her, promising an even better, more versatile replacement. He hints at a new project that will allow them to be personally involved in the Labyrinth's defense. This foreshadows a significant shift in their approach.

A chaotic entry announces Milim Nava's arrival, dragging a bruised and bandaged Gobta and Ranga. She is furious that Hinata defeated her pet dragons in her absence, explaining she put Gobta and Ranga through 'Hell Mode' training as retribution. Rimuru Tempest is shocked by their injuries, but Milim remains unrepentant, demanding an update on the mercenaries.

Rimuru Tempest unveils his groundbreaking 'Avatar System.' He explains that 'Pseudo-Souls' and 'Master Cores' will allow individuals to project their consciousness into artificial bodies, bypassing standard AI limitations. He demonstrates by animating a blue-flame slime, controlling it as if it were his own. Veldora Tempest, Milim Nava, and Ramiris are instantly captivated by this technology.

Veldora Tempest, Milim Nava, and Ramiris eagerly create their own avatars. Veldora becomes a giant armored knight, Milim a small red slime, and Ramiris a skeleton. They immediately engage in a playful, chaotic brawl. Rimuru Tempest explains his plan: these player-controlled avatars will serve as 'secret bosses,' providing dynamic, unpredictable challenges. In the Labyrinth's upper floors, novice adventurers stumble upon Rimuru and Veldora in their avatar forms, mistaking them for easy kills. They are quickly overwhelmed by the immense, terrifying pressure, realizing they've encountered something far beyond their depth.