Why does elya becomes cursed by madam?

Elya becomes cursed by Madame Zeroni because he fails to fulfill a promise he made to her. She had asked him to carry her up a mountain to drink from a special stream and, in return, she would help him win the love of a girl named Myra. After Elya neglects to honor this agreement, Madame Zeroni places a curse on him, which affects his family for generations. This curse serves as a pivotal element in the story, driving the plot and Elya's descendants to eventually confront their past.