Arnold turns an embarrassing mistake into a political victory, while Silver unleashes devastating ancient magic to end the slime crisis.
The episode 9 of The Insipid Prince’s Furtive Grab for the Throne starts with Arnold Reks Adler operating far from the image of the supposedly useless seventh prince. Disguised as the SS-class adventurer Silver, Arnold has just completed a dangerous request and returned to the Adventurer’s Guild in the imperial capital. His defeat of a King Minotaur has earned him another bounty and further reinforces Silver’s reputation as one of the continent’s most powerful adventurers. Instead of drawing attention to himself, Arnold casually shares alcohol with the guild workers and asks to be given priority when difficult requests appear.
That carefree attitude quickly disappears when Sebastian, Arnold’s butler, informs him that General Dominik has died. The circumstances surrounding the death are unclear, and Arnold suspects there may not even be a serious investigation. The news is another reminder that the struggle surrounding the imperial throne is becoming increasingly dangerous. Arnold cannot remain detached forever, especially because his twin brother Leonard is now preparing to enter the succession battle.
Back at the Castle of the Imperial Sword, Arnold and Leonard finally discuss their position. Leonard admits that he does not want to fight his own family for the throne, but Arnold makes the reality clear: refusing to participate could leave Leonard, Arnold, and their mother vulnerable to their rivals. Leonard ultimately accepts that he must fight for the throne. He plans to build a force capable of protecting himself, while Arnold takes responsibility for finding allies.
The arrangement fits Arnold perfectly. Leonard is the one who genuinely wants a peaceful life, while Arnold is willing to operate behind the scenes and do whatever is necessary to make that future possible. Leonard even admits that he would rather spend his life enjoying himself with a beautiful wife than become emperor, but he needs Arnold to help him reach that goal. Their relationship is unusual, yet their shared objective gives Arnold a clear reason to support Leonard.
One major problem remains: Arnold cannot simply reveal that he is Silver. His use of ancient magic is dangerous politically because the royal family considers ancient magic taboo after their great-grandfather became obsessed with it. If the truth about Silver were exposed, Leonard could suffer because his twin brother is secretly using the forbidden power. For now, Arnold believes his reputation as the “insipid prince” is actually useful. People underestimate him, and that gives him freedom to move without attracting suspicion.
Arnold and Sebastian search for a powerful noble family that has not yet joined one of the major factions. They discover that only the Kleinert household remains outside the fight for the throne. However, the Kleinerts are dealing with a monster crisis inside their territory. Arnold immediately sees an opportunity. If Leonard can supposedly provide Silver’s assistance, the Kleinerts could become indebted to Leonard without realizing that Arnold and Silver are the same person.
There is a risk. Using Silver openly could make the Kleinerts suspicious of Leonard and eventually expose the connection between the prince and the legendary adventurer. Arnold accepts that danger because Silver’s involvement could also make Leonard’s enemies think twice before attacking him. He decides that this is worth the gamble.
Before leaving, Sebastian warns Arnold about Finne Von Kleinert, the duke’s daughter known as the Blau Mowe. She is famous for her beauty, and Sebastian worries that Arnold could become distracted. Arnold brushes off the warning and heads to the Kleinert mansion while disguised as Silver.
The first attempt goes badly. The person guarding the entrance refuses to believe that Arnold is really Silver. Since the Adventurer’s Guild had not announced that an SS-class adventurer was coming, the guard assumes he is an impostor and sends him away without even checking his adventurer card. Arnold does not force the issue. Instead, he quietly leaves and returns to his other identity.
Arnold then travels to the Kleinert domain as Prince Arnold. Five days later, he meets Duke Kleinert and immediately begins applying pressure. Arnold explains that Leonard had arranged for Silver to help the territory with its monster problem and expects the duke to understand that such assistance deserves compensation in the form of political support for Leonard.
The duke is stunned because he has no idea that Silver had already visited his mansion. Arnold initially treats the situation as if the Kleinerts have deliberately insulted Leonard. Sebastian eventually realizes that the family truly did not know who they had turned away. Arnold then reveals the important detail: Leonard had deployed an SS-class adventurer during a time when he was already caught in the struggle for the throne.
The revelation completely changes the atmosphere. Duke Kleinert realizes that Silver really did come to help, while his own household accidentally rejected the very person they desperately needed. Arnold has successfully transformed the family’s mistake into leverage for Leonard. He even admits privately that he merely deepened a wound that the Kleinerts had already created themselves.
When the truth comes out, the duke is furious with his son for sending Silver away. The son argues that nobody would expect an SS-class adventurer to simply appear at the gate, but the duke points out that he could have checked the man’s adventurer card. The mistake now threatens the entire household’s relationship with Leonard.
The duke offers his own head as an apology, but Arnold has no interest in punishing him physically. He wants something far more useful. The conversation becomes even more dramatic when Finne steps forward and offers herself as compensation. She asks Arnold to forgive her father and brother. Her willingness to sacrifice her own position shocks the family.
Arnold, however, does not simply accept the offer. Sebastian advises him to calm his anger and handle the matter discreetly. Arnold understands that Leonard’s strength comes partly from his forgiving nature and the people naturally drawn to him. If Arnold damages Leonard’s relationship with a powerful duke without his brother’s knowledge, it could ultimately hurt Leonard’s political standing.
Instead, Arnold orders the duke to find Silver so he can speak with him directly. This gives Arnold another chance to control the situation while keeping the identities of the prince and adventurer separate. When Finne meets Silver, Arnold is already prepared. Through illusion magic, he creates a false image of Silver and allows Finne to believe that she is speaking with the real SS-class adventurer. The deception works. Finne apologizes sincerely for her family’s behavior and asks whether Silver will take the monster extermination request again.
Silver agrees, but only under one condition: Duke Kleinert must fully support Leonard. Arnold refuses to make things easy for the duke, insisting that political loyalty must be clear and unconditional before he will complete the request. Finne asks him to help anyway, promising that she will convince her father to support Leonard.
Arnold then surprises Finne by lowering his head and begging her to help save the people of the Kleinert domain. To Finne, this changes her impression of him. She had expected someone frightening, but she begins to see Arnold as a prince willing to sacrifice his pride for ordinary people. Arnold privately admits that this is not exactly why he bowed, but he is perfectly willing to let Finne misunderstand his motives if that misunderstanding benefits Leonard’s cause.
The episode then shifts toward the actual monster crisis. A group consisting of two A-class and four B-class adventurers has already been fighting the creatures, but the problem has continued to grow. The individual slimes are not especially dangerous, yet the mother slime continuously produces more of them. Destroying individual creatures cannot solve the problem. The source itself must be eliminated.
The leader of the adventurer party, Abel, confronts Silver. Although Abel respects Silver’s legendary status, he does not want his party to simply stand aside because an SS-class adventurer has arrived. Silver understands that pride. He also recognizes that the group has done important work by preventing the monster infestation from spreading further.
Abel explains that his party has already fought the mother slime but lacks enough firepower to deliver a fatal blow. Silver offers a practical solution. If the party refuses to let him handle the threat, he will report the situation to the Guild and have an emergency quest issued, then return to deal with the monster. The message is clear: this is no longer a matter of pride when lives and territory are at risk.
Abel finally accepts that the mother slime is beyond their current capabilities. Silver thanks the adventurers for holding the line and preventing further damage. Rather than humiliating them, he praises their efforts and tells them to visit the capital guild branch if they ever need his help.
Then Arnold finally reveals why Silver was never worried about the mother slime’s enormous size. Standing before the monster, he invokes the power of ancient magic. His spell takes on a divine and judgmental tone as he calls upon heavenly laws and prepares to unleash overwhelming firepower.
Arnold casts Execution Prominence, an ancient magic technique powerful enough to wipe out the entire slime threat in a single devastating attack. The mother slime and the surrounding slimes are completely exterminated, ending the crisis that the other adventurers could not resolve.
Despite saving the entire domain, Arnold has no interest in becoming celebrated as a hero. He leaves the official report to the other adventurers and quietly returns to his private quarters. His goal was never fame. The real objective was to protect Leonard’s future, secure the Kleinerts as potential allies, and keep his identity as Silver hidden.
The episode ends with that carefully maintained disguise finally becoming harder to contain. Arnold is in his room when someone approaches and addresses him as Sir Silver. The visitor then realizes that the man before her is actually Prince Arnold. Finne is shocked to see the supposed “insipid prince” connected to the legendary adventurer she had just encountered.
The Insipid Prince’s Furtive Grab for the Throne Episode 9 is one of Arnold’s strongest demonstrations of political intelligence and hidden power so far. Rather than winning allies through brute force alone, he turns the Kleinert family’s mistake into leverage for Leonard while protecting the identity of Silver. The scenes with Finne also give Arnold a more complicated side, as he knowingly allows her to misread his motives while still putting himself in a position to save the Kleinert people. The monster battle provides the episode’s biggest action payoff, with Execution Prominence showing just how terrifying Arnold’s ancient magic can be. Most importantly, the ending threatens to expose the connection Arnold has worked so carefully to conceal, making Finne’s discovery a potentially major turning point for Leonard’s succession campaign.
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