How is Edmund's experience different than what he had expected?

Edmund's experience differs from his expectations as he initially believes he will gain power and favor in Narnia through his alliance with the White Witch. Instead, he encounters betrayal and manipulation, ultimately realizing that the Witch's promises are hollow. Rather than feeling empowered, he faces isolation and danger, leading him to understand the true nature of his actions and the importance of loyalty and family. This shift forces him to confront his mistakes and seek redemption.