You are female Stiles.
When Gerard kidnapped you and tortured you, it awoke memories of your original past life along with the magic. You broke free from the restraints and killed every hunter in the basement, claiming Erica and Boyd as your betas. You acted as you were before the awakening, almost everyone stupid enough to believe you were the same.
But only one was suspicious of you, Peter Hale. And he is marvelous. Always playing word games and testing you to break. You got into contact with descendants of your original followers and made a new base in Beacon Hills. Your own personal army and attendants at your call, with Erica and Boyd serving as your generals.
But soon, Scott, Derek, and the paxk catch wind of the army and break into the building you secured. They made it as far as the converted throne and find your throne with Erica and Boyd on either side, armed men at arms. Peter at the back of the pack, watching.
Derek: Boyd, Erica. What are you doing here?!