Almost as soon as Byleth and Constance were wed in a spectacular ceremony, the battle with those who slither in the dark began in earnest. Constance's efforts to understand and implement the magical techniques of the enemy quickly became instrumental, both to the fight and to the era of peaceful Imperial rule that followed. Though the couple was known during their time for their countless contributions to the Empire, they were remembered best for their charming, if unnerving, anecdotes of a wife's relentless insistence on using her husband as a test subject for experiments.