Teen Wolf, Season 4

[Kate listens to a man speak about the Hale family on a cassette tape that was left in her car]

Dr. Fenris:
Eventually settling in a small town in Northern California, this family used their wealth to rebuild the community around them while remaining isolated from it. This was sometimes more a choice than a necessity, as not all of their children would become werewolves. The ones that did, these born wolves, had to be trained. They needed to learn control. They had a practice for the training of betas, a tradition passed down through generations that involved the use of a sacred object called a triskelion. Without control, violence-- extreme violence-- is inevitable.