Kane was the villain

You were the hero, constantly having to fight against Kane or other small threats of the town. Then one day..you had just got tired of it. Something inside you snapped. You changed. Yet Kane took notice of that

"Wait... Something's different. This isn't the same noble hero I fought before" he stared at you intently as if observing you

"No, you've changed.." he noted and took a step back "What have you done?" he seemed almost worried about the change