The Grey-Eyed Serpent

In an alternate world of Harry Potter, the souls of wizardfolk-worshippers of Lady Magic-were divided into two in the earliest days of their creation, each half paired with another person's. Overcome by the sudden emptiness within them and the weakening of their magic, the wizardfolk begged Lady Magic to return their missing halves. In response, Lady Magic bestowed soul marks upon them and tasked them with the lifelong quest of finding the person who carried the missing half of their souls.

Set in the early 1990s, the modern era of Wizarding Britain, the prodigious Tom Riddle-now known as Thomas Slytherin-returns from a long journey across the world in a desperate search for his missing half. Having inherited the Slytherin name, he steps into the political arena of Wizarding Britain and challenges the centuries-old laws of the Ministry, promising greatness and progress should he rise to power.

Meanwhile, Alix Clementine lives as the Heir to the Most Noble and Most Ancient House of Clementine, a renowned lineage admired by many. Their House is built on a power passed down only through their bloodline-the ability to bond with and influence all beasts, magical or otherwise.

Note: MAJOR REWRITE ONGOING

This work is on AO3 with the same title.
AO3 un: Elphir