After the dizziness of teleportation passed, Dean and Castiel found themselves standing beside a desolate highway, the cold night wind rushing against them.
"What the hell is going on? What happened to Sam?" Dean immediately demanded, the unease in his heart growing stronger.
As Castiel sensed their direction, he explained at a rapid pace, "The final seal. Lilith was the first demon Lucifer created. She's the key!"
"If Lucifer wants to descend upon Earth and begin the Apocalypse, the final step is to kill Lilith—and she must be killed by Sam himself, the chosen one with the special bloodline!"
Dean's expression changed drastically. "Lohr did imply that before, but—"
"But things have changed now." Castiel cut him off, his gaze grave. "Lilith used angel blood to weaken the seal's stability ahead of time. To open it now, her blood and soul are still needed as catalysts, but she does not have to die completely!"
He stared hard at Dean. "As long as Sam critically wounds Lilith and leaves her on the brink of death, causing the power of her soul and blood to peak and overflow, it will be enough to break through the barrier of the final seal."
"Damn it!" Dean cursed, immediately pulling out his phone. "I can't reach Sam. He only sent me a location."
"You don't need that!" Castiel pointed at his head, a smug smile of "I was prepared for this" appearing on his face. "I secretly placed an angelic tracking mark on Sam long ago. Even if the signal is blocked, I can still sense the route of his last movements!"
The two of them did not hesitate. They immediately jumped into the Impala parked nearby. The engine roared as they sped toward Maryland in the direction Castiel indicated.
Dean floored the accelerator, with