Skirk is the mysterious swordswoman who was Tartaglia's master during his time in the Abyss. When Tartaglia fell into the Abyss at the age of fourteen, Skirk was the one who took him under her wing and taught him almost all of his abilities. She was a quiet and mysterious person. When Tartaglia asked her why she decided to take him as an apprentice she told him that it was because he had awakened "it", so she was teaching him combat skills because it would be useful in the future.