Silla Heks is one of the many members of the Heks family. She is related to Stina, Vika, Ollie and Timkin Heks.

She was the elf who took care of Greyfell. Silla Heks noted all kinds of interesting observations about the way her alicorn had affected her emotions. She also thought that alicorns have a special way of inflicting their feelings on others - both good and bad. Silla relocated Greyfell pre-keeper. As a result of her success preparing him for the Sanctuary, other Hekses believed they had a right to Silveny.