Dean and Sam Winchester, the famous demon hunters from the TV show Supernatural, often relied on their trusty demon-killing knife to dispatch their supernatural foes. This weapon was especially effective against lower-level demons, offering a quick and guaranteed kill. However, there was always one demon who seemed to fear this blade more than anyone else – Lilith.
Lilith, the first demon ever created, made her debut in Supernatural season 3 and quickly established herself as a formidable adversary for Sam and Dean. In season 4, her death became crucial in bringing about Lucifer's release. The demon-killing knife had a proven track record against weaker demons, but Lilith, despite her immense power, seemed unnerved by it. This raised the question:
Sam and Dean had noticed Lilith's aversion to their weapon of choice. The knife, though ineffective against powerful demons like Alistair and Crowley, could still cause discomfort to Lilith. However, showing any signs of weakness would be detrimental to her ultimate plan. Lilith possessed the ability to prevent others from using the knife through her own powers, and thus she managed to avoid facing it directly.
Many speculated that Lilith simply pretended to be afraid of the knife, especially since her associate Ruby, who was secretly working with her, had introduced it to Sam. Lilith, known for her manipulation and deceit, might have felt it advantageous to let Sam believe he had an advantage over her. After all, Sam was determined to kill Lilith, and if giving him the illusion of power helped move her plan forward, then she was more than willing to play this game.
So, while Lilith's fear of the demon-killing knife may have seemed like a plot hole, it was more likely a deliberate part of her devious scheme. By allowing Sam and Dean to believe they held the upper hand, Lilith could manipulate events to her advantage, ultimately leading to her own demise by Sam's hand and the release of Lucifer.