What is the climax in Dracula from Jonathans diary?

In Jonathan Harker's diary from Bram Stoker's "Dracula," the climax occurs when he realizes the true nature of Count Dracula and his intentions. As Harker discovers the extent of Dracula's powers and his ability to control others, he becomes increasingly trapped within the Count's castle. This moment marks a turning point in the narrative, as Harker's initial fascination turns to Horror, setting the stage for the ensuing battle against Dracula's malevolence.