Changes

Ruby accompanies Sam as he kills Lilith's minions and then confronts Lilith herself. When Dean arrives, Ruby smirks at him and [[Telekinesis|telekinetically]] locks him out to prevent him from interfering. When Dean starts to get through to Sam with his yells, Ruby screams at Sam to hurry up and kill Lilith, which he eventually does. At first, Ruby is stunned that Sam actually managed to kill Lilith, then grows jubilant because—as she reveals to an appalled Sam—Lilith's death was the last seal and they have just set [[Lucifer]] free. She explains that she has secretly been working for Lilith all along to free Lucifer (something only Lilith herself knew), and basks in her success after all that she has gone through in bringing this about, declaring herself the best, most loyal demon. Her exuberance fades when Sam tries to kill her for her treachery with his powers. Sam accuses her of "poisoning" him with [[demon blood]], but she tells him that the choices he has made all year have been all him; she only laid out the possibilities and he chose the "right" way each time. She tries to convince Sam that Lucifer's freedom is a good thing and they will be rewarded. She also starts to tell Sam why he was the only one who could bring this about but is interrupted when Dean finally breaks in and charges towards her. Ruby turns to confront him, taunting him that it's too late, only to get caught off-guard when Sam grabs her from behind and holds her in place as Dean stabs her with [[Ruby's Knife|her own knife]]. She chokes in pain as a vengeful Dean twists the knife and continues stabbing carves into herbody, prolonging her agony before he finally removes the knife and she dies.