The entire bunker was quiet, everyone falling down their own research rabbit holes to find out what a "messenger of God's destruction" was supposed to be. Dean yawned, looking over the table at Grace. She had curled up in her chair, balancing her book on her knees. Completely focused on her work, she paid no attention to him. Sam was thinking about making more coffee when a sudden crashing downstairs made them all jump. "Was that the armory?"

"That's the armory. We didn't leave anything locked up in there, did we?"

Abandoning their books, the three of them reached for their guns, which were never too far away in the bunker. Dean led the way, swinging the armory door open to find something next to impossible had appeared, seemingly out of nowhere. "Is that a Fiat?" Grace asked, trying to see over the boys' shoulders. "What the Hell?"

In front of them sat a small, mint green car. As surely as Dean stood in front of her, he also got out of the driver's seat of the car. Sam got out of the passenger seat - a different Sam, with different hair - but it was still clearly Sam. Both of them were far too dressed up for hunting. Or for anything, really. "Bro - we did it."

They watched in shock as a woman in a blue dress got out of the back of the car. Grace reached out for Dean as she watched the alternate version of herself dust herself off and reach for Sam. "Honey, we made it!" Sam bent down to kiss her, the real Winchesters grimacing.

"Umm."

They all locked eyes with their counterparts, for a brief second, the rift flaring and pulling them back into their dimension. "Okay, can I be the first to say… What the Hell was that?" Grace asked, the boys shaking their heads as they stared at the now-empty armory floor. "That was us, but... not us. Wait, do you think they were they running from Chuck?"

"Maybe Cas'll know," Sam said, leading the way upstairs. "There might be something on Angel Radio that we're missing. If people are running from Chuck, there would be a lot more coming across dimensions all over the world."

Cas was just as clueless as they were. If he had to hazard a guess, he would've blamed it on Chuck. There was no way anyone would hop dimensions unless they really needed to, and with Chuck ready to unleash his wrath on them, it only made sense that he was pursuing them in every universe. "They were running." Billie materialized behind the group, making everyone jump. "He's almost done destroying other worlds. It's time for the next step."

"What do I need to do?" Jack emerged from the shadows, munching on a snack. "I'm ready. What is it?"

"You need to find the Occultum."

"What's that?" Dean asked. "Is it some kind of weapon?"

Billie gave a cryptic answer before vanishing again. "It's like a weapon, but not a weapon. We need to be careful. If Chuck finds out what we're doing, the whole thing comes crashing down."

Everyone knew what to do. They abandoned their old books, starting to hunt down anything and everything that could possibly have to do with the Occultum. Grace opened her laptop, running a search of their database to see if she'd entered anything on it before. While the program was running, they carried armfuls of books into the war room. Jack and Dean started on weapons research. Sam and Grace grabbed the oldest spell books they had, hoping it was some kind of magic or a ritual that had been lost to time. Cas reached for long-forgotten biblical texts, hoping there was something in there that could help. Before long, they had all settled in to read again.

When Grace's laptop pinged, everyone looked up at her, hoping for an answer. "There's only one result. It's mentioned in Biblical Geography: A Comprehensive History. Literally two lines. Apparently no one seems to know what it is, but it's been hidden for millennia. Maybe we should be checking fringe theories, the kinds of books that only sell a couple hundred copies. Stuff that would normally fly under the radar."

Dean got up, thinking he would grab a bunch of the Men of Letters' compilations. Sam cracked open a new book as Cas left to see if he could call in a few favors. Someone had to know something, it was just a matter of finding them. "You know, Jack's going to have to kill Amara too. If we go through with this, the whole world is going to be thrown off balance," Dean said, turning to Grace after Jack had put his headphones in. He kept his voice low, trying not to attract attention. "How are we going to take two of them out at once?" Sam glanced up for a second, going back to his reading but still listening in.

"We can deal with that when we come to it. Right now we - we're dealing with things as they come up. There's not much else we can do. First we find the Occultum, and then we figure out what comes next." She squeezed his hand, going back to her book, but finding nothing helpful. "We put out the fires we can, and then we look for the real source. Or it finds us. We just have to be ready when he does."

All of them struck out, their research leading nowhere. The bunker door swung open sometime later, Cas taking the stairs two at a time. "Sergei said a faith healer has it. She's supposedly been using it as part of her business."

"My money's on Sister Jo," Sam determined. "She's been awfully quiet lately."

Dean nodded, standing up again. "Let's go track her down." Turning back to Grace, he stopped to ask if she wanted to come with. "It'll get you out of here. You need a change of scenery. Seriously, when's the last time you left the bunker?"

"I should stay here. I've got research to do."

"We've got a lead on the Occultum. What else is there to research right now?"

Grace set her book aside as she put her glasses back on. "If - when - Jack goes after Chuck, this isn't going to be a normal fight. It's an apocalypse in a bottle. We'll be standing right there, and you, me, and Sam, we're the only humans involved in this thing. We're going to be hit with more power than anyone's ever seen, even more than the Michael-Lucifer showdown. We can't survive that on our own. We need to be there, but I don't know how we can do it without getting vaporized. Not yet, anyway."

"Alright, well, don't stress yourself out too much. We'll be back soon," Dean smiled, kissing the top of her head before he and Sam took off for the door.

Grace, Cas, and Jack would eventually split up. While she stayed in the library, the others went to make dinner. Though she didn't have a lot of faith in their cooking skills, she knew they wouldn't burn the bunker down, so she put on some music and let them be.

She hadn't found much when she heard another crash coming from the armory. Not bothering to tell Cas and Jack about her suspicions, she approached the armory alone, her gun drawn, only to find that the alternate universe version of herself was standing there, the boys not far behind. They couldn't tell that she was there, or so it seemed. Until she looked herself in the eyes.

Grace - the real Grace - stared at herself, her phone starting to ring. The alternate Grace watched as she answered the call, unable to hear but still clearly able to see her. "Dean, what's up?" She stared into her own eyes as Alternate Grace tried to read her lips. "Everything okay?"

His voice was muffled by the car radio, Sam turning the volume down so he could talk. "Ruby's stashed the thing in Hell. Sister Jo's been working with her, apparently. This doesn't all track, but it's what we've got. Time to get on the highway to Hell. Again."

"I'll see what I can find out. Are you back on the road?"

"Yep. Should be home in an hour. Want me to pick something up for dinner?"

"Sure. I don't know what Cas and Jack are making, but who knows how well they'll do. Hey, I think that rift is opening up again. I'm down in the armory, and - I don't know, I can see Alternate Us, but - well, you're going to have to take a look when you get back. I'm going to bring Cas down here and see what he thinks."