One

Two years after the Pack defeat Monroe and her army, they finish their college and move back to Beacon Hills. Then Scott meets Ruth Coleman. Scott thinks he hears a heartbeat in the woods and they find a girl and she turns out to be something they've never need before. Ruth Coleman can heal 10 times faster and is 10 times stronger than they are. Her eyes turn a glowing purple when she shifts and she has other powers they have yet to discover.