He chains Fortunato to the wall and seals him into the niche using bricks.
Montresor heard Fortunato's jingling bells from outside the niche when only the eleventh tier was left to be plastered in. This sound added to his feeling of satisfaction and finality as he completed his revenge against Fortunato.
The climax of "The Cask of Amontillado" comes when Montresor walls Fortunato up in a niche in the wall of the catacombs. Fortunato's drunkeness is beginning to wear off, and he realizes Montresor's intent. When he moans, he is no longer in a drunken stupor, but acknowledging his fate. As Montresor places the last brick in the wall, he thrusts a torch behind the wall and the only response was the jingling of bells from Fortunato's costume. At this point, Fortunato is dead (possibly from a heart attack from the shock), and there is no going back for Montresor.
Montresor tells Fortunato to step forward, follows him, locks him in a niche, then closes up the entrance to the cavity and covers it up with old bones from the catacombs.
Montresor believes that fortunato has repeatedly insulted him
Montresor heard jingling bells when he tried to see inside the niche, which reveals that Fortunato was still alive and conscious. This detail adds to the suspense and horror of the story, as it foreshadows Fortunato's terrible fate.
Although Montresor tells Fortunato that the Amontillado is at the end of the passageway, in reality it is the niche in which Fortunato will be imprisoned and left to die. In that sense it is the end of Fortunato's life that is at the end of the passageway.
Yes, Montresor's conflict with Fortunato is resolved when Montresor successfully executes his plan for revenge by walling Fortunato alive in the catacombs. After this act, Montresor feels satisfied that he has taken his revenge and resolved his conflict with Fortunato.
It seems to me that the rising action would be when Montresor talks about amontillado that he got and luchesi in front of Fortunato which immediately makes Fortunato want to check it out because he thinks of himself as a wine connoisseur and does not want to miss out. What the reader and Montresor knows that Fortunato does not is that its all a trick to get Fortunato killed. E.B.
Not knowing what Fortunato did to Montresor heightens the horror of the story because the reader is never certain if Fortunato ever did anything wrong against Montresor that was deserving of such revenge. If Fortunato's so-called injuries and insults had been laid out for the reader to see, the reader would either sympathize with Montresor or with Fortunato depending on the reader's own point of view. Not knowing what was ever done, in deed if anything had even been done, leaves every reader wondering if Fortunato's death is just a terrible mistake by a madman.
In Edgar Allan Poe's "The Cask of Amontillado," Fortunato is tricked by Montresor into following him into the catacombs, where he is ultimately immured alive in a tiny niche as revenge for an unnamed insult.
It is not mentioned in the short story specifically why Montresor was insulted by Fortunato except that it was verbal.
The story does not say why Fortunato insulted Montresor. In fact, there is doubt that there ever were any insults at all. They might have simply been a product of Montresor's imagination