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Darkness Cannot Drive Out Darkness, Only Light Can Do That

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“You know, this could all be over in an instant. All you need to do is say the magic word.”

Sam shook his head jerkily from side to side. “No,” Sam replied hoarsely.

Lucifer’s left eye twitched. “Fine. Why would you be stupid enough to come here again anyway? Just coming back for more, aren’t you, Sammy?”

Sam swallowed.

“I came because the Darkness has been released and you can stop her.” Lucifer raised his eyebrows.

“Really? Can I? How interesting! Well, I shouldn’t take all the credit, but I suppose...” He grinned and leaned forward. “Would you like to make a deal with the Devil?” Sam backed up against the wall of the cage, his voice shaking.

“How do we defeat Amara?”

Lucifer crossed his arms. “Straight to the point, are we? Well then, you must know it wasn’t just me. It was my brothers as well. But it was mostly me.”

He saw the look on Sam’s face and rolled his eyes.

“And no, I’m not just saying that to boost my ego. You know how there’s that thing, ‘Darkness cannot drive out darkness, only light can do that.’ Well, I’m the light and she’s the dark.” He frowned, realizing what he just said. “Literally.”

“What did your brothers do?”

Lucifer smiled. “I guess you could say they helped, ‘flip the switch.’ But there also was a weapon. A sword.”

Sam raised his eyebrows. “Well, do you know where it is?”

Lucifer shrugged. “Nope. But that’s only one of your problems. There is only one being in the universe that can wield it. That being is me.” Sam groaned.

Their only chance at defeating Amara is saying yes to Lucifer.

“You think I'm going to say yes. I’m not going to say yes.”

“I assumed that. How pesky you humans are with stubbornness. But, lucky for you, I want Auntie Amara gone as well.”

Curiosity stirred in Sam.

“Why?”

Lucifer shook his head. “That doesn’t matter. While I would love for you to say yes, and I ride around in your skin, we’re both at desperate measures here. So, I’ll give you another solution.”

Sam froze, warily looking at Lucifer.

“You’re giving me another solution. Other than riding around in my skin.”

Lucifer sighed. “I did tell you that was my preferred option. But, you, seemingly as stubborn as a mule, won’t say yes, I have another.” Sam nodded, crossing his arms.

“Shoot.”

“The mark.”

Sam paled. “What?!”

Lucifer shook his head, crossing his arms and looking up at the ceiling of the cage.

“You misunderstand. It’s not the one you are thinking of. It’s actually the complete opposite. I would be making my grace into a mark.”

Sam hesitated. “Is that even possible?”

“Yes.”

“Is there any side effects that I should know?”

“Well, you’ll have a personal Lucifer following you.” Lucifer sighed. “I suppose it would be nice to have my conscious outside of the cage for once…”

Sam looked alarmed. “What? You’ll be out of the cage?”

“I’m hurt, Sam! You don’t want me free?” He smirked, but then was serious again. “But essentially, yes. My form will remain in the cage, but my mind can follow you around if I please. I won’t always be there, though. Hmm. You’ll probably have some of my powers as well. I suppose that’s helpful.” He tapped his chin.

“And you’re sure this will work. This will stop her.”

Lucifer nodded, suddenly sure of himself. “Yes, I’m confident. My mark shouldn’t make you bloodthirsty like it did for your brother, Dean. If anything, it’ll make you pure. Never mind that. But remember the sword. Only you can wield it. The jawbone is very similar. Both are powerless without their source. Will you do it?”

Sam sighed. He was probably going to make the worst decision in his life. But he had to.

“I’ll do it.”