ASSASSINATION
Not long after Shawn turns to the good side, a new breed of advanced vampires called Assassin vampires appear. Kaitlyn is home alone, her brother out with friends, mother at a religious meeting. Suddenly the door is kicked down and vampires storm Kate's house. A group of assassin vampires attack. She jumps up from the couch and bolts upstairs, they chase. She runs to her room and slams the door shut. The assassin vampires bang on the door. One punches through it and rips a hole. Kate tries to reach for a hellfire gun while holding the door closed. She decides to just dive for it. The door smashes open, Kaitlyn firing. Two vampires burn up. The others flee. Kate gets up, slowly exiting the room, watching for vampires. She gets to the stairway and slowly heads down. A vampire jumps up and tackles her. Kate throws it off and fires. She continues down and kicks as a vampire comes up from behind. It crashes through the rear glass sliding door. Another drops down from the upstairs. She fight it, slashing it's throat. She slams the vampire on the floor and shoots it in the back of the head. It burns up. Tired and worn out, she calls Giles and Willow. They investigate the existence of a vampire that can enter a home without needing invitation. Kate describes them. They were not Uber Vamps. It ends up that these vampires are normal vamps, given super strength.
Giles, "Oh dammit. That orb. It must have been used."
These vampires are deadly and are never alone. Assassin vampires were thought to have been wiped out in the early years of the A.D. time period. The orb itself was lost in the 200s A.D.