What is the climax of The Supernaturalist?

The climax of the book The Supernaturalist by Eoin Colfer occurs when the protagonist, Cosmo Hill, confronts the main villain, Lucien Drazen, aka The Supernaturalist. The final battle between Cosmo and The Supernaturalist takes place in the abandoned attic of Cosmo's house, where the magical artifact known as the Lexicon is hidden. The conflict escalates as Cosmo uses his newfound supernatural abilities to challenge The Supernaturalist's dark powers. Their encounter culminates in a climactic showdown, determining the fate of the world and revealing the truth behind the ancient legends and prophecies.