Arnold's secret identity as Silver becomes more dangerous in Episode 6 as he manipulates the Kleinert family, secures a path toward Leonard's support, and unleashes forbidden ancient magic against a deadly slime outbreak.
The episode 6 of The Insipid Prince's Furtive Grab for the Throne starts with Arnold Reks Adler learning from his butler Sebastian that General Dominik has died. Arnold suspects the death may have been connected to the ongoing struggle for the throne, but with few details available, he decides to finish his current adventurer request before returning to the castle.
Arnold is secretly operating as Silver, one of the continent's five SS-class adventurers. Sebastian warns him about the danger of a prince disguising himself as an adventurer, but Arnold insists that he is not acting as the so-called "insipid prince" at that moment. As Silver, he completes a difficult request involving a king minotaur and receives his bounty at the Adventurer's Guild. His reputation is so strong that the guild staff treats him with enormous respect, and Arnold casually gives them alcohol as a gift before leaving.
Back at the Imperial Sword Castle, Arnold meets his twin brother, Leonard Reks Adler. The death of General Dominik has made the succession conflict even more dangerous, particularly because Dominik was apparently targeted for supporting their side. Arnold admits that avoiding the battle for the throne is no longer possible. Leonard agrees to cooperate and tells Arnold that he should build a force strong enough to prevent their enemies from threatening them.
Arnold, however, has no intention of becoming emperor himself. He wants Leonard to take the throne so that he can eventually live a quiet life away from politics. His first task is therefore to find powerful allies for Leonard. The problem is that almost every influential noble and minister already belongs to one of the factions supporting the first three princes.
There is one major exception: the Kleinert household. The family has remained outside the succession struggle because its territory is currently suffering from a serious monster invasion. Arnold sees the perfect opportunity. He plans to make it appear that Leonard sent Silver to help the Kleinerts, creating a debt that could eventually bring the powerful family into Leonard's faction.
Arnold refuses to publicly reveal that he is Silver. His ability to use ancient magic is a major reason. Royalty considers ancient magic taboo because Arnold's great-grandfather became obsessed with it and ultimately lost his mind. Revealing that Leonard's twin brother is secretly using ancient magic could damage Leonard's chances of becoming emperor. For now, Arnold believes his reputation as an incompetent prince is actually more useful than revealing his true strength.
Arnold first visits the Kleinert mansion while disguised as Silver. The plan immediately goes wrong. The person at the gate refuses to believe that he is really the famous SS-class adventurer and dismisses him without even checking his adventurer card. Arnold leaves without meeting the duke, but instead of being frustrated, he quickly turns the mistake into an advantage.
Arnold returns to the castle and announces that he will travel to the Kleinert domain as Prince Arnold. His plan is simple: because the Kleinerts have already rejected Silver, Arnold can use the incident to pressure them into supporting Leonard. Sebastian recognizes the manipulation behind Arnold's plan, but Arnold is confident that the situation will work in their favor.
Five days later, Arnold arrives at the Kleinert domain and meets Duke Kleinert. He immediately raises the issue of compensation, explaining that Leonard supposedly sent an SS-class adventurer to assist the duke during the monster crisis. The duke is genuinely confused because he had no idea that Silver had visited.
Arnold initially assumes the duke is pretending to know nothing, but Sebastian quickly realizes that the duke appears to be telling the truth. Arnold then learns that someone within the Kleinert household actually sent Silver away. The situation becomes even worse when the duke discovers that his son was responsible for rejecting the adventurer without checking his identity.
The duke is furious with his son, realizing that the family's mistake may have cost them the assistance of one of the most powerful adventurers in the empire. He offers his own head as an apology, but Arnold refuses. Instead, he demands something that would benefit both the Kleinert family and Leonard.
That is when Finne Von Kleinert steps forward. She asks Arnold to forgive her father and brother and accepts responsibility for the family's mistake. Her willingness to sacrifice herself immediately changes the mood. Arnold's attendants also advise him not to let his anger destroy the relationship with the Kleinerts, particularly because Leonard's reputation for forgiveness is one of the reasons people are drawn to him.
Arnold eventually agrees to handle the situation discreetly. He orders the duke to find Silver so that he can speak with him directly. When Finne later encounters Silver, she apologizes for what happened and admits that her family was at fault for rejecting him.
Silver agrees to take the monster extermination request, but only after confirming that the Kleinert family will support Leonard. Finne insists that her father would never betray them, but Silver refuses to accept a vague promise. He demands full and unconditional support from the duke's household.
Finne then makes an emotional appeal and asks Silver to eliminate the monsters regardless of whether the political agreement has been completed. She promises that she will personally secure her father's support. Silver questions whether she really expects him to trust an "insipid prince," but Finne continues pleading for help because the people of the domain are still in danger.
Eventually, Silver accepts. He makes it clear that the Kleinert family's support remains a condition, but as an adventurer, he cannot simply ignore a monster threat that is continuing to endanger civilians. Finne thanks him, believing that Arnold has lowered his head and swallowed his pride for the sake of the people.
The situation also reveals another layer of Arnold's deception. He had used illusion magic to create a false image of Silver, allowing Finne to believe she was speaking directly with the famous adventurer. Arnold's manipulation succeeds, and Finne's opinion of him begins to change. She had expected the supposedly insipid prince to be frightening, but his willingness to humble himself makes her question everything she had heard about him.
The monster crisis itself is far more serious than expected. A party consisting of two A-class and four B-class adventurers has already been deployed, but their efforts have failed to eliminate the source of the infestation. Individual slimes are not especially dangerous, but the enormous mother slime continues producing more creatures. Unless the mother slime is destroyed, the outbreak will never stop.
The party leader, Abel, initially refuses to simply step aside for Silver. As an A-class adventurer, he wants his team to finish the job they accepted. Silver respects their determination but points out that their previous attacks have failed to deliver a fatal blow because they lack enough firepower.
Rather than belittling the adventurers, Silver praises their work. Their efforts prevented the monsters from spreading farther and limited the damage to the surrounding area. He assures them that their contribution matters and tells them that the Adventurer's Guild should recognize what they accomplished.
Silver then approaches the mother slime himself. What follows is the episode's biggest action sequence. Instead of relying on ordinary combat techniques, Arnold reveals the terrifying power he has kept hidden from the royal family and the wider world.
He invokes ancient magic and unleashes Execution Prominence, a devastating attack that summons overwhelming flames. The technique completely annihilates the slime infestation, including the massive mother slime that the other adventurers could not defeat.
The victory instantly resolves the monster crisis, but Silver has no interest in being celebrated as a hero. He leaves the recognition to the adventurers who fought before him and returns to his private area. His real objective was never fame. He wanted to protect the Kleinert territory, strengthen Leonard's political position, and continue hiding the truth about his identity and ancient magic.
Back in his private area, Arnold considers the matter finished. But the episode delivers one final twist. Someone unexpectedly enters the area and addresses him as Prince Arnold. It is Finne.
Her discovery creates a dangerous new problem for Arnold. He has spent the entire episode carefully maintaining the separation between the supposedly useless Prince Arnold and the legendary SS-class adventurer Silver. Now Finne has suddenly appeared in his private space and recognized him as a prince. Whether she has uncovered the connection between Arnold and Silver remains uncertain, but the secret he worked so hard to protect is clearly in danger.
The Insipid Prince's Furtive Grab for the Throne Episode 6 delivers a strong combination of political strategy, secret identities, character development, and fantasy action. Arnold's plan to use his Silver identity to manipulate the Kleinert situation gives the episode a clever political edge, especially after the family's mistake of turning Silver away becomes leverage for securing their support for Leonard. Finne also receives meaningful development as her willingness to protect her family and her people changes her view of Arnold. The monster storyline provides the episode's biggest action payoff when Arnold finally unleashes the forbidden ancient magic technique Execution Prominence and destroys the mother slime in spectacular fashion. However, the most important moment comes at the end, when Finne unexpectedly encounters Arnold and calls him by his royal identity. That final discovery puts Arnold's carefully protected double life in serious danger and sets up an intriguing conflict for the next episode.
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