The episode 17 of That Time I Got Reincarnated as a Slime Season 4 starts with the political situation surrounding Lubelius becoming increasingly dangerous. Demon Lord Rimuru has already set out for Lubelius with the failed Heroes, while Demon Lord Leon is also preparing to head there because of his connection to Otherworlders. Meanwhile, Yuuki Kagurazaka and his forces continue moving according to their plan, while the Five Elders remain aligned with the Rozzo family.
With the northern region no longer providing protection, the balance of power begins to shift. The Rozzos see an opportunity to attack Lubelius, creating a situation that could force Guy to intervene. The episode makes it clear that several major players are moving at the same time, and their goals are beginning to collide.
The story then focuses on Leon and his search for Chloe Aubert. He wants confirmation that the summoned children are in Rimuru's territory. He eventually learns that Chloe is indeed among them. Leon's secrecy has caused others to distrust him, but he insists that his only intention is to save Chloe.
He is also warned that the Rozzo family is preparing an attack against Lubelius. Intelligence suggests that the family intends to exploit the loss of northern protection and drag Leon and other powerful figures into the conflict. Leon is offered an escort toward Lubelius, although he remains focused on his own objective.
Back in Rimuru's territory, the atmosphere initially appears calm. Rimuru is spending time with his companions while discussing the upcoming Council meeting in Engrassia. He explains that his new military attaché will handle the Council's affairs, with Diablo having found someone capable for the role.
That peaceful moment ends when Hinata receives an emergency report. An unknown force has invaded the Grand Cathedral in Lubelius, and a battle has already begun.
At the same time, danger reaches Rimuru's own surroundings. The children are practicing when chaos breaks out outside. Shion keeps them calm, while Rimuru arrives and assures them that they are safe. He orders Shion to protect the children while he and the others deal with the attackers.
Rimuru soon learns that one of the enemies is an extremely dangerous Insect. Diablo recognizes that the creature is in its final, perfect form and explains that Insects are natural enemies of demons. Despite the danger, Diablo remains confident that he can handle the opponent.
Rimuru decides to confront the enemy's leader instead. He soon comes face-to-face with Granville, the head of the Five Elders and leader of the Rozzo family. Granville blames Rimuru for what happened to Maribel and makes it clear that he wants revenge.
Granville refuses to fight Rimuru directly. Instead, he sends other fighters against him. Rimuru quickly realizes that some of these opponents are Otherworlders. Even worse, they are being affected by both a curse and mental control, meaning they have been turned into weapons against their own will.
This creates a difficult situation for Rimuru. He does not want to kill innocent people who have been manipulated, but Granville deliberately uses them to exploit Rimuru's compassion. The conflict therefore becomes more complicated than a simple battle between enemies.
Meanwhile, Hinata faces another powerful enemy connected to the Seven Days Clergy. The opponent attempts to send Maria to find Luminus, even allowing her to kill Luminus if necessary. Hinata realizes that the enemy has been hiding their true strength, and the confrontation quickly escalates.
Rimuru also notices that Diablo is distracted by something approaching Lubelius. He orders Ranga to assist Shion against the Insect so Diablo can investigate the greater threat. Shion encourages Diablo to trust his comrades instead of attempting to handle everything himself.
Diablo accepts the decision and leaves the battle to Shion and Ranga. Before departing, he also makes sure that Venom understands his responsibility to protect the children at any cost. The battlefield is now divided into several dangerous confrontations, with Rimuru's allies fighting different enemies simultaneously.
Diablo eventually realizes that Granville's attacks are being used as diversions. Granville knows about Luminus's Holy Ark, raising the possibility that the Rozzo leader intends to force the hidden treasure into the conflict.
That threat becomes real when Laplace, Footman, and Maria appear before Luminus. They deliver a message from Granville, who demands that Luminus come to him or watch people precious to her die.
The confrontation quickly turns violent. One of the attackers blames Luminus for the death of his brother, while Luminus orders her followers not to damage the Holy Ark. Maria is eventually killed, but Luminus realizes that Granville has used necromancy to manipulate the situation.
Elsewhere, another confrontation begins when an enemy reaches Luminus's hidden treasure. The attacker discovers a coffin made entirely from pure spiritrons, designed to burn magical beings. However, the weapon fails against Diablo.
Diablo immediately recognizes the person standing before him. The enemy knows him by his former name, Noir, while Diablo insists that he should now be called Diablo. The opponent is Raine, one of the Primordials.
Raine mocks Diablo's decision to serve Rimuru and questions why someone as powerful as a Primordial would choose to live without pursuing greater strength. She believes Diablo has wasted his potential, especially after his history with Guy.
The battle begins, but Diablo barely treats it as a serious fight. He repeatedly dodges Raine's attacks, frustrating her. When she accuses him of running away, Diablo finally responds with overwhelming power.
He uses multi-stage Disintegration while fighting, demonstrating an extraordinary ability to manipulate spiritrons. Raine is shocked that Diablo can use such destructive magic without being destroyed himself.
Diablo explains that complete devotion to one's master allows him to control spiritrons. His loyalty to Great Rimuru is therefore directly connected to the confidence and power he displays during the battle.
Diablo ultimately overwhelms Raine and dismisses her strength, even comparing her unfavorably to Testarossa before her evolution. Raine is stunned because Diablo has only recently evolved into a Demon Peer, yet his strength is already far beyond what she expected.
The episode then delivers its biggest cliffhanger. Diablo realizes that another familiar presence is nearby. He identifies the Primordial known as Rouge, who is now known as Guy Crimson.
Guy finally appears and casually acknowledges Diablo after their long separation. His arrival dramatically raises the stakes of the entire conflict. With Rimuru battling Granville's forces, Hinata fighting in Lubelius, Shion and Ranga dealing with the Insect, Luminus facing the Pierrots, and Diablo confronting a Primordial, multiple major forces are now converging around Lubelius.
That Time I Got Reincarnated as a Slime Season 4 Episode 17 is a tense and action-packed chapter that successfully brings several storylines together around the crisis in Lubelius. Rimuru faces Granville's revenge-driven attack while refusing to treat controlled Otherworlders as ordinary enemies, giving his confrontation an emotional dimension. Hinata is pulled into another dangerous battle, while Shion and Ranga take responsibility for the powerful Insect. The standout sequence belongs to Diablo, whose battle with Raine showcases both his overwhelming strength and his absolute loyalty to Rimuru. The final appearance of Guy Crimson is the episode's biggest hook, suggesting that the conflict surrounding Lubelius is about to reach an entirely different level. Overall, the episode combines political tension, multiple battles, character development, and a major cliffhanger to set up an explosive continuation.
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