Chapter 1: The Creation and Counter
Year 1632
Gormlaith Gaunt's Village, Ireland
Gormlaith Gaunt stalked the premises of her 'dear' sister Rionach's home on the oddly warm October night. She knew what she had to do, she was the only one with the necessary vision to do what needed to be done.
She couldn't let her sister corrupt her niece. Not with her Muggle-loving ideas.
In the end, it took two spells, the first one cast immediately upon her arrival, hissed in the language of Parseltongue.
"Incendio."
She then had precious few minutes before the entire house went up in flames, crept through an open window where her beautiful niece Isolt slept, when she heard a voice.
"So, Gormlaith. I assume this isn't a social call. You haven't come to see me in years, and only now you arrive? What do you want?" Rionach's smooth, soft voice said calmly.
Gormlaith snarled at her 'sister'. How dare she question her! No matter, she would be gone soon, however she could torment her before she left. She needed some fun.
Gormlaith began speaking in Parseltongue, her preferred language before pointing her wand at her 'sister', and speaking the words of a spell that would become one of the Wizarding World's most infamous spells, so infamous in fact that the Wizarding World would label this spell, along with two others, as Unforgivable.
"Avada Kedavra!"