That Time I Got Reincarnated as a Slime Season 3 Episode 23: Rimuru’s Founder’s Festival Concludes with the Dungeon Trial

That Time I Got Reincarnated as a Slime Season 3 Episode 23, titled The Labyrinth’s Grand Opening, premiered on September 20, 2024, on Nippon Television in Japan. In this captivating episode, Rimuru Tempest’s executives launched the Dungeon during the third day of the Founder’s Festival.

Adventurers including Eren, Basson, and Masayuki embarked on an adventure into the dungeon, facing a series of challenges. Additionally, Mjollmile and Shoka presented intriguing details about the dungeon. This episode marked the conclusion of the final grand event of the Founder’s Festival.

Disclaimer: This article contains spoilers from That Time I Got Reincarnated as a Slime Season 3 Episode 23.

That Time I Got Reincarnated as a Slime Season 3 Episode 23: Shoka and Mjollmile Summon Adventurers for Dungeon Exploration

Mjollmile and Shoka (Image via 8Bit)
Mjollmile and Shoka (Image via 8Bit)

That Time I Got Reincarnated as a Slime Season 3 Episode 23 opens with Shoka and Mjollmile introducing the audience to the next thrilling attraction of the Founder’s Festival: the Dungeon. They plan to showcase only a glimpse of the expansive dungeon to entice visitors.

From the spectators’ area, Ramiris showcases her magic by materializing the Dungeon’s entrance. Shoka then introduces the various adventurer groups ready to embark on this dungeon quest. The first group is Team Great Lightning, commanded by Basson, alongside members Eren, Kaval, and Gido.

Shoka introduces Masayuki's party (Image via 8Bit)
Shoka introduces Masayuki’s party (Image via 8Bit)

The third participant group includes Masayuki, the Lightspeed Hero, and intriguingly, Gaiye opts to tackle the dungeon challenge solo. His dramatic entrance and taunts to the Big Four irritate Rimuru’s executives, but Rimuru encourages them to overlook it.

Following the introduction of the adventurers, Shoka reveals that the progress of each team will be broadcast live on large screens. She also announces that dryads will accompany each group to assist them during their exploration. After that, That Time I Got Reincarnated as a Slime Season 3 Episode 23 continues with Shoka disclosing the dungeon rules.

Gaiye, as seen in the episode (Image via 8Bit)
Gaiye, as seen in the episode (Image via 8Bit)

Prior to entering the dungeon, various items are available for purchase. Shoka and Mjollmile highlight the Resurrection Bracelet, which allows adventurers to respawn if they perish inside the labyrinth. They clarify that its abilities are effective only within the Dungeon’s confines.

Gaiye, skeptical, requests Mjollmile to demonstrate the bracelet’s capabilities. In a dramatic turn, That Time I Got Reincarnated as a Slime Season 3 Episode 23 showcases Gaiye killing Mjollmile as proof, much to the audience’s shock. Mjollmile is revived outside the dungeon, confirming the item’s effectiveness.

That Time I Got Reincarnated as a Slime Season 3 Episode 23: The Dungeon’s Trial Begins

Kaval and Eren (Image via 8Bit)
Kaval and Eren (Image via 8Bit)

The narrative progresses in That Time I Got Reincarnated as a Slime Season 3 Episode 23 as the courageous adventurers face the myriad challenges within the dungeon. Basson’s team falls victim to a minor trap on the first level created by Ramiris.

Rimuru learns from the Pixie that she made some adjustments to the Dungeon’s design after the final layout was established. While Basson’s group tumbles into a trap, Eren and his allies pass through effortlessly, quickly discovering a treasure chest.

Rimuru and Ramiris in the episode (Image via 8Bit)
Rimuru and Ramiris in the episode (Image via 8Bit)

Ramiris sheepishly confides in Rimuru that she had inadvertently disclosed the locations of secret traps in exchange for a cake. Meanwhile, the episode reveals that the dungeon consists of three types of treasure chests: bronze, silver, and gold.

Gold chests contain premium loot but only appear on boss floors (multiples of ten). Mjollmile also mentions that the dungeon features a total of 100 floors. Veldora is stationed on the final level, while Boyix has the responsibility of being the boss of the 50th floor.

Masayuki, as seen on the giant screen (Image via 8Bit)
Masayuki, as seen on the giant screen (Image via 8Bit)

The storyline shifts focus to Masayuki’s party as they swiftly navigate through the dungeon, reaching the fourth floor in under thirty minutes. Concurrently, Gaiye ascends to the second floor, determined to make his way directly to the stairwell.

Rimuru ponders whether Gaiye possesses any magical artifacts to assist in tracking his position. The Great Sage reveals it is thanks to the adventurer’s Elemental Magic Automap. Conversely, Veldora contemplates how best to engage with adventurers upon their entrance to the final floor.

That Time I Got Reincarnated as a Slime Season 3 Episode 23: Eren and Masayuki’s Teams Press Deeper into the Dungeon & Conclusion

Veldora, as seen in the episode (Image via 8Bit)
Veldora, as seen in the episode (Image via 8Bit)

That Time I Got Reincarnated as a Slime Season 3 Episode 23 reveals Basson’s team struggling to navigate the dungeon’s traps. Despite dying and reviving repeatedly, they persist. Meanwhile, Team Kaval probes deeper after gathering sufficient potions.

Mjollmile questions their desire to uncover rare items, noting that acquiring such treasures is only possible from the gold chests in designated boss locations. Additionally, Mjollmile suggests that area bosses, controlling particular floors, may also possess them.

Eren's team gets the Tempest Sword (Image via 8Bit)
Eren’s team gets the Tempest Sword (Image via 8Bit)

Rimuru discovers from Ramiris that she has also revealed the locations of these area bosses. Eren’s team stumbles upon one such area, battling a swarm of bat monsters. Upon victory, they loot a golden chest containing the legendary Tempest Sword.

Upon exiting the Dungeon, they enthusiastically share their exciting experiences, inspiring other adventurers in the audience to attempt entering the dungeon. Meanwhile, Masayuki’s group faces off against a formidable boss monster. Jinrai easily vanquishes the boss, claiming a rare item from the golden chest.

Gaiye and a Dryad (Image via 8Bit)
Gaiye and a Dryad (Image via 8Bit)

That Time I Got Reincarnated as a Slime Season 3 Episode 23 shows Gaiye finally reaching the same floor, but he discovers that a boss monster respawns every thirty minutes. Infuriated, he demands the dryad in charge revive the monster immediately.

Gaiye’s outrageous behavior leads to the Dryad expelling him from the dungeon. When he revives outside, he appears unconscious. After the conclusion of the dungeon trial, Rimuru Tempest addresses the crowd, expressing his vision to officially open the Dungeon in the near future.

Rimuru gives a speech (Image via 8Bit)
Rimuru gives a speech (Image via 8Bit)

He reassures the audience of its safety and promises that anyone who can reach the final floor will be granted a chance to challenge him. The Dungeon unveiling event thus comes to a festive close.

The festival’s final night culminates in a grand banquet where monsters and humans joyously celebrate together, just as Rimuru had envisioned. Nonetheless, Rimuru is aware that one important matter remains unresolved. That Time I Got Reincarnated as a Slime Season 3 Episode 23 concludes with Rimuru planning to address the timeline for the gold coin payment due date.

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