After Becoming Cannon Fodder, I Switched to Fortune Telling

She traveled through time and became a cannon fodder aunt, and she put the mahogany sword against the villain's neck at the beginning. I wanted to pretend to be a magic stick to save myself, but I didn't know that "Who are you planning to consecrate with this sword?", So I forced myself to put on talismans to chop down trees and make up feng shui. It wasn't until the rainy night that he used the secret of sacrifice to expose my disguise: "You are exchanging your life for my life." I thought this call for "aunt's life" was for cannon fodder, but I didn't expect that he made a backhand prediction and it turned out to be - I am his only variable and his only destination.