Gormlaith Gaunt

Gormlaith Gaunt was an Irish pure-blood witch. She was the aunt of Isolt Sayre, the founder of Ilvermorny School of Witchraft and Wizardry. Gormlaith had attended Hogwarts School of Witchcraft and Wizardry.

Lineage
Gormlaith was a descendant of Salazar Slytherin, one of the founders of Hogwarts School of Witchcraft and Wizardry. She was born into the Irish branch of the family. She believed in the same pure-blood supremancy Slytherin did and owned his wand.

Early Life
Gormlaith was born in Ireland. She had one sister named Rionach. At some point, Gormlaith attended Hogwarts School of Witchcraft and Wizardry.

Raising Isolt Sayre
Gormlaith became estranged from Rionach by the time her niece Isolt Sayre was born around 1603. Rionach was helpful to her Muggle neighbours by producing cures for them and their livestock. She did not seem to share her family's beliefs in their pure blood superiority. One day, Gormlaith started a fire at Rionach's house of Ilvermorny cottage which killed her and her husband William Sayre. Gormlaith "saved" Isolt because she hoped to put her on the right path. She believed Rionach's idea of helping Muggles would lead Isolt to marry one. She then moved her niece to the neighbouring valley of Coomcallee.

Gormlaith kept Isolt for twelve years and was very wicked to her niece by making her watch when she jinxed any Muggle or animal which strayed too close to their cottage. She wouldn't let Isolt attend Hogwarts because she said it was an establishment which taught Mudbloods. She would say it was a shame Slytherin had been unable to stop them attending and wouldn't even let Isolt have her own wand. Gormlaith left Isolt feeling very alone and thinking her aunt was insane. At some point, Gormlaith began teaching Isolt Dark magic until Isolt had learnt enough to be able to escape along with Gormlaith's wand. However, Gormlaith was very good at hunting people down, and so she eventually found Isolt living in England. But when Isolt escaped a second time and took the Mayflower to the New World, Gormlaith would not find Isolt again for some time.

Finding Isolt
Some time later, around 1634, Gormlaith found out a headteacher at a new school of magic in the New World was nicknamed "Morrigan". She remembered her niece was named this by her father because of their lineage to Morrigan himself. When she also heard the school was named Ilvermorny, she knew it was Isolt because it was the name of the same cottage Isolt was born in and Gormlaith set fire to. She was also upset to hear Isolt had married a Muggle and opened the school up to anyone with magic and not a select few of pure-bloods.

Gormlaith went to Ollivanders, a wand shop she did not want to buy from. She was given a wand with a dragon heartstring core before she took the ship the Bonaventure under the guise of man with the name of William Sayre - the same name of Isolt's father and someone she killed. The Bonaventure landed in Virginia before Gormlaith made her way in the winter to Mount Greylock, Massachusetts where Ilvermorny School was placed. She wanted to kil Isolt and her husband James Steward and steal their young daughters, Martha and Rionach Steward. She wanted to set them on the same path she hoped the mother should have done.

Gormlaith said a spell with the name of Isolt and James which put them in a deep sleep before she spoke Parseltongue to make Isolt's wand - which one belonged to Gormlaith - become inactive. But when Gormlaith went into Ilvermorny, she had not known Isolt had two adoptive sons aged sixteen and fourteen who were skilled with a wand made of Horned Serpent horn. When she spoke Parseltongue, she had awoken their wands instead which warned Chadwick and Webster Boot of Gormlaith. Chadwick had dreamed of such a Dark witch coming to Ilvermorny and went out to meet and stop her.

Death
Gormlaith underestimated Chadwick when they began to duel because even though she was more powerful than him, he had been well taught by Isolt. Gormlaith didn't want to kill Chadwick because she thought he was very talented and wanted to know whether he was a pure-blood. She told him she would not want to kill him if he was because he had so much potential. However, Chadwick would not reply and when Webster eventually joined them, the Horned Serpent horn core the brothers wands shared made their power increase. The duel woke up young Martha and Rionach Steward who were scared and cried for their parents. Gormlaith did not understand love because the cries of their children woke Isolt and James by breaking through the enchantment Gormlaith had placed upon them.

Gormlaith, Chadwick and Webster were then joined by Isolt but the wand she took with her was still inactive and proved to be unhelpful. Gormlaith then drove them back inside the castle and upstairs to the room where she could hear her great-nieces crying. When Gormlaith managed to break down the door to the room, she found James stood in the front of his daughters to protect them. But when Gormlaith went to kill him, Isolt said the name of her father William which instead called upon the pukwudgie she had befriended several years earlier. The pukwudgie pierced Gormlaith's heart with one of its poisonous arrows tipped with Pukwudgie venom which reduced her to nothing except dust and a broken wand of which nothing but some of its core remained.

Physical Appearance
In all known depictions of her, Gormlaith was known to have extremely fair, if not deathly pale skin, brown hair, and gaunt, sunken features. Her facial features bore a striking resemblance to her distant relative Tom Riddle's appearance after becoming Lord Voldemort due to their mask-like features and very thin to nonexistent lips. It was likely that Gormlaith's use of dark arts, like Voldemort's, warped and altered her appearance, becoming less human due to her infusing her body with dark magic and lost her looks to the malicious powers of evil.

Personality and traits
Gormlaith was a pure-blood supremacist and dark witch with an unstable temper. She was obsessive, controlling, and homicidal, to the point where she was willing to murder her own sister due to not sharing traditional Gaunt family beliefs. She was so consumed by her pure-blood fanaticism that she was willing to kill at the slightest provocation, and would be willing to spare only pure-bloods but more than willing to murder or torture anyone else.

Magical abilities and skills

 * Dark Arts mastery: Gormlaith was incredibly talented in the Dark Arts, having immersed herself into magic aimed largely at bringing pain and death to others, to the extent of it altering her physical appearance. She was noted to have forced her niece to watch as she cursed and jinxed any Muggle or animal that strayed too near their cottage, showing her proficiency with malicious spell-casting. It is also possible she was capable of conjuring and controlling Fiendfyre, seeing as cursed flames of such destruction would be more efficient in ensuring the demise of her sister and brother-in-law than simply magically setting the house on fire, which would have enabled the two wizarding parents to easily distinguish it. Being the one commanding the fiendfyre would also allow her to enter the house to 'save' Isolt without endangering herself.
 * Dueling: She was a gifted duelist, capable of overcoming the combined efforts of both Chadwick and Webster Boot during her attack on Ilvermorny and drove the brothers back inside the castle, despite the twin cores of their wands increasing their power tenfold, which speaks for her considerable capability at martial magic.
 * Tracking: Gormlaith was noted for her prodigious talent of tracking people down. She very easily managed to locate her niece in England when she fled from Gormlaith, only for Gormaith eventually find her not long after.

Etymology

 * Gormlaith is a spelling derived from the name Gormflaith which is an Irish name meaning "blue or illustrious princess". It was one of the most popular Gaelic-Irish female forenames between the 8th and 16th century.
 * 'Gorm' is also the Irish for 'blue' 'green' or 'grey' depending on the dialect.
 * Gaunt is a way of describing the physical appearance of someone, meaning lean, haggard or grim.

Behind the scenes

 * The merchant ship Bonaventure did list a William Sayer on the passenger manifest for its 1634 voyage to Virginia. The listed Sayer was 58 years old at the time.
 * Gormlaith's manner of death is described similarly to various deaths in the later Harry Potter films, particularly those of Bellatrix Lestrange and Voldemort.

Notes and references
Gormlaith Gaunt