Every story has its what-ifs. The tiniest deviations might very well cause an entirely different outcome, resulting in a derived timeline. Such is the Butterfly effect. What if the greatest hero of the Celts were to be more...let us say, modernly sophisticated? What if the most feared godslayer and queen of the shadowlands were to set eyes upon this anomaly? This is such a tale of the Hound that was NOT Cú Chulainn. (A fate franchise-inspired story with NO self insert or Isekai)