Saerilinn the high mage and her accidently shapeshifted apprentice Runic

Saerlinn had warned Runic to go slow with her studies as her power was great but her control was noticeablely lacking, but the intemprant young elf was set on learning to protect her village and sought to learn the bigger more offensive spells. When she discovered a powerful shapeshift spell, she learned it but in her haste she only glossed over the section explaining how to make sure the changes could be undone. When Saelinn returned from fetching some ingredients to find a black fox with the same exact silvery birthmarks that had given Runic her name nearly 97 years ago, she was only mildly surprised. She chose not to return her student to herself until she had learned the value and wisdom of patience. Going on 150 yrs later she feels the girl may finally have learned from her mistake.