Final answer:
Montresor lures Fortunato into the crypt by exploiting his vanity and expertise in wine, using the promise of an Amontillado tasting to guide him into the trap.
Step-by-step explanation:
Montresor manages to lure Fortunato into the back of the crypt by appealing to his pride and his connoisseurship in wine. He teases Fortunato with the promise of tasting a rare vintage, the Amontillado. Aware that Fortunato considers himself a wine expert and cannot resist the opportunity to validate such a rare find, Montresor tempts him despite the dampness of the catacombs and his apparent concern for Fortunato's health. With deft psychological manipulation, Montresor ensures that Fortunato's suspicion remains at bay as they descend into the cold depths of the Montresors' vaults.