The following assumes you've at least beaten New Vegas and the three current (As of this writing) FNV expansions and Dragon Age II, otherwise SPOILERS!
Lucky 38, New Vegas, Year 2283
"With the battle that could decide the very fate of Vegas looming over our heads, you sure find a lot of time to go on random adventures out of the Mojave." Cass said to the Courier, who had just returned from Big Mountain, and had called everyone in for a meeting.
"And yet no matter where I go, I can't seem to find something that doesn't need my immediate attention, it's like this world can't find someone else to solve its problems."
"My old man knew someone like that too, apparently, some even called him the 'Chosen One' believe me, it's not just you. So, who's the fancy armor for?"
"Found it in the Big Empty, belonged to someone named Christine I met at Sierra Madre, figured I'd give it to Veronica."
"Christine? Did you see here again?" Veronica came walking in, her voice eager, "And why do you keep running into people from my past? Have you been reading my diary?"
"She was there before I got there, she's probably still at the Madre, but that's neither here nor there," The Courier took a deep breath, "All these seemingly disjointed events seem to point to two things, another courier with the Old World flag on his back, and the Divide. It all seems too coincidental, like he knew I'd be in those places."
"So another vacation then, boss?" Raul asked.
"Not right now, I feel like this other courier is going to contact me soon, right now, we figure out how to use the tech I found to help us win this war. I can transport it all from Big MT pretty easily with this." The Courier brought out the Big Mountain Transportalponder, their "prize" for keeping the Think Tank out of the Mojave. "Unfortunately it only can send one person, and I have no idea how it works, so we can't make more, unless…"
"Unless Veronica and I poke around inside and figure out how it works?" Arcade asked.
"Well, unless you want Lily and Rex to do it, but I don't think that'll end well." Veronica joked.
"Exactly, but It's a sensitive piece of machinery, I'm worried about what will happen if…"
CRUNCH! For some reason Rex took it upon himself to turn the Transportalponder into a chew toy. And the whole suite began being filled with a white light.
"That can't be good…" the first words Boone said all day.
Hawke Estate, City of Kirkwall, Year 9:37 Dragon
"You're about to go on the run and you make a stop at your house? Hawke, you've got to be smarter than that." Aveline warned.
"Aveline, how long have you known me? And how long have I been known to play it safe? Besides, I've got supplies for everyone stored here, and none of us can stay."
Varric chimed in, "If I know anything about storytelling, this seems like a convenient way to get us all in one place for something big to happen."
"Something 'big' already happened; we just killed both the Knight Commander and the First Enchanter. Not to mention that fool mage's crime." Fenris added.
"I'm right here you know, I did what had to be done." Anders replied.
"You murdered a few dozen innocents and showed everyone just how terrifying a mage can be. I hope it was worth it."
"Everyone just stop, this is getting us nowhere!" Merrill shouted.
"Enchantment!" Sandal's voice caused everyone to turn, and see he had somehow gotten ahold of Meredith's sword.
"Oh no, Sandal, be a good boy and put that down…" Hawke slowly stepped toward him, but the sword broke in half without warning, causing a red light to fill the estate.
"That can't be good…"
Mojave Wasteland? Time and Date unknown.
Veronica woke up in a daze, "Did I sample Cass' moonshine again? My head is killing me…" She put her bare hand up to her forehead trying to recollect the past events, and dull the pain, only to notice something unfamiliar as she put her hand on the ground.
"Grass. And lots of it…" Too adjusted to the post apocalyptic desert of the Mojave, she didn't expect to see it grow so plentifully, but something was off, interwoven among the grass was patches of wasteland that looked all too familiar, and it all started coming back.
"That transporta-thingy! Something must've happened when Rex took a chunk from it! But what? I need to find the courier and…and, where is everyone?" Her eyes darted around for signs of life, and saw the body of a (hopefully) unconscious Boone. "Crap! Boone! Don't be dead!"
She ran to his body and gave him a good punch (which, if Arcade were here, he would say is just about the worst thing to do), Boone was startled awake, and pulled his knife almost as a reflex. "Whoa! Boone, you need to chill! I wasn't trying to hurt you…much."
"You need to be more careful, this could've ended badly."
"But it didn't, and I'm stuck with the only person who talks less than ED-E. Anyway, I don't think we're in the Mojave anymore, or we are but…well it's hard to explain, so just look!"
Boone picked his sunglasses off the ground and put them back on, took a look around to see the plant life around them, "Oh! It's so beautiful, you're speechless, huh? Wait, that's you all the time."
"This isn't time for jokes, let's go."
"But it's what I do best!"
The pair got up to leave and almost as soon as they began to walk, they realized they were surrounded, "Ghouls?" Boone asked
"No, ferals don't use weapons like that. Or at all" These creatures were bone-white and wearing what appeared to be armor, holding what were more splints of metal than actual swords. "There are a lot of them, I can only punch so much!"
"We'll do what we can." Boone already lined up a shot and took out three of them with a single shot. Veronica began rushing the crowd, using her power fist to smash several limbs and skulls. But the horde was closing in what could they do?
That is, until sharp tendrils came from the ground holding the several of the monsters in place and crushing others. The pair turned to see two others, a man and a woman, thin with pointed ears, one with a staff, another with a large sword.
"Fenris! There are other people here! They need our help."
"Yes, but first we deal with the darkspawn."
"Darkspawn?" Veronica asked herself, assuming that was what the creatures were called. But there was little time for thought, as the four continued to fight on, eventually defeating the monsters. Finally the four had time to talk.
"What are darkspawn doing this far from the Deep Roads?" The girl asked.
"I'm not even sure how far we are, this place looks like it's had a fair share of blight."
"Um, excuse me, could someone explain what's going on?" Veronica asked, "Start from who you are, and work your way up to what the hell a darkspawn is."
"I could ask you the same, especially given the twisted abominations I've had to deal with today. But, I suppose I'll start, I am called Fenris."
"And I am Merrill, pleased to meet you!" the girl added.
"Well, nice to meet you too! Anyway, I'm Veronica, and this is Boone. He's not big on small talk. And now that we all know each other, can you please give me some answers? Are you two mutants? Ghouls? Some undocumented beings?"
"Haha! Elves? Like in Taeles of Chivalrie? You're joking! You've got to be…oh, you're serious, aren't you?"
"Believe me, you're not the only ones lost. I'm curious about the strange weapons you are using, but what seems to have become of this world is more pressing."
"Not to mention the creatures we saw when we woke up, horned lizards walking on two feet, with gigantic claws! I wanted to take one of the babies as a pet."
"And you nearly got us killed. The mother was rather cross with us."
Veronica chimed in again, "I take it you guys have never seen a deathclaw before. But not many people can say they've survived an angry deathclaw mother. But I'm still confused, I'm not going to assume we're stuck in another world because stuff from our world is here too. Actually, I'm pretty sure we just ripped the universe a new one."
"A new one? A new what?" Merril asked.
"Please don't tell me my idioms and slang are lost on you, they're all I've got! Well, those and my power fist."
"I'm sorry, did you just say that monster was called a 'deathclaw?" Fenris asked perplexed, "Appropriately named as it is, I'm curious as to how it came to be."
"Well, when a mommy deathclaw and a daddy deathclaw love eachother—"
Boone suddenly looked to the distance and spoke for the first time since they were rescued. "It's not safe to keep talking here. We need to find some landmarks we recognize and get to somewhere secure."
"Alright, but a lot of the Mojave's rocky terrain looks the same I don't think…is that Black Mountain?"
"I was sure it was Sundermount, it's the only really big mountain around here." Merrill said, "But they…they don't like me very much there."
"That's an understatement."
"Well I'm sure there's a story there, but that will be for later, if that's Black Mountain, then Hidden Valley is right by it, and you'll find nowhere safer besides the Lucky 38, which for one reason or another is not visible on the horizon at the moment...there's another city in the way…weird"
"Let's go then."
The walk toward the mountain allowed more freedom to talk. "Okay, so what the hell is a darkspawn? Because it felt like there was no end to those things." Veronica asked
Fenris answered, "Creatures that come from the Deep Roads during the blights, but for some reason are appearing now after whatever the hell happened here."
"Okay, remember? Not from around here? To me, you are just making words up."
Fenris sighed, "They're a series of underground tunnels, which once belonged to the dwarves-"
"There are dwarves too?"
"If you would give me just ten seconds, I could explain a lot more! You don't hear me asking about your bizarre gauntlet, or whatever that 'rifle' thing is."
"Fine, whatever, go on."
"So a blight is when the darkspawn decide to show up on the surface, and wreak havoc, with the help of a demon. Yes there are demons too."
"Well that helps, sort of. I have to say, for a broody stoic type, you definitely can keep up the snark. Boone could learn a thing or two. And it looks like we're nearing Black Mountain."
"Do your people always name your landmarks so plainly?" Merrill asked.
"Well, it doesn't have the appeal of 'Sundermount' but it's a name that's been around for long before I was born, so that's what I'm going to call it. Last I checked that place was crawling with Super Mutants."
"Now who's making words up?" Fenris added.
"Look, when you get a sledgehammer to the face, you'll get to see just how 'made up' they are. But let's take a step back, Merrill was it? What's with that stick you have? Some kind of new energy weapon? It does some crazy stuff, like I've never seen."
"I'm sorry, I'm not sure what an energy weapon is. But this is my staff, it channels my magic."
"Whoa, let's back up a second, first elves, dwarves, demons, now magic? What kind of fantasy world did we end up in?"
"Believe me, whoever fantasizes about this world must be truly disturbed indeed." Fenris replied, "A world with no magic, now that's something I could see myself enjoying."
"Well, it's not the greatest thing where we come from either, but we make do. You guys do magic like we do technology, and it can be just as dangerous I'm guessing."
"You wouldn't even know."
"I came from a world where at one point they made explosives that could level a whole city. My family raised me to believe all technology is evil. Yes I might just have a little idea."
"What about you world Veronica?" Merrill asked, "We've told you so much and we know so little. I'm still curious about deathclaws!"
"You are so unbelievably cheery it's adorable. Boone could learn from you too." As Veronica spoke, Boone muttered under his breath and pretended not to listen.
Veronica continued, "Well, you know those bombs? They release massive radiation, which is pretty much heat, and it caused many normal animals to become monsters." Veronica said, without skipping a beat. "Well, this was a fun talk at least, it's helped calm me down. We can talk more when we get to Hidden Valley, which should be…what the fuck?" They'd reached Hidden Valley…sort of. It was at the base of the mountain, as Veronica remembered, and the bunkers were there, but at the center was a small encampment, with more elves.
"So it is Sundermount! But why are there metal boxes sticking out of the ground everywhere?" Merrill asked.
"More elves…but there's Brotherhood too. What's going on?" The group moved in closer to learn more, but was interrupted, "Why have you returned? And you bring more shemlen?" another elf approached them, focused on Merrill.
"Fenarel, there is no time for this. Whatever these boxes, or 'bunkers' as Veronica calls them are doing here, these people know something about it."
"This doesn't change anything, we cast you out for your betrayal, you are not permitted—"
"Hey, we're not done here!" Supreme Paladin Hardin walked up to the elves, "What the hell are you doing at our bunker? And give me one good reason not to shoot you!"
"I could say the same to you shemlen, I could have an arrow through your head before you have time to put that helmet on!"
"Hardin, what's going on here? Nothing is where it should be!"
"Well apparently, these elves think they can come into our stronghold and do as they please."
"We were were here first human."
"Paladin Hardin! Stand down!" Elder McNamara appeared from the bunker with an elderly elven woman.
"Calm yourself da'len. Now is not the time for conflict, our world may face a much greater threat." As the woman spoke, Merrill's eyes began to well up, "Keeper? But how?"
"My visit to the beyond seems to have been a brief one, whatever happened has brought these two worlds together, the Free Marches and this 'Mojave' are one, and while I do not have a full grasp of the circumstances, I know the Fade has shaken, allowing souls to return to the living world. I feel my return may be temporary, however. When the worlds return to their rightful positions, as will I."
"Okay, now you guys are making words up. I'm lost again."
"The Fade is where all the dead must pass to reach the afterlife, Keeper Marethari died at my hand, because I was too stupid to listen to her. I knew her return couldn't be that simple. In the end your blood is still on my hands"
"Now is not the time to despair child, we must work to fix this, there is no telling of what will happen when two physical realms overlap."
"I-I'm sorry, this is all too much to take in right now I…I need to lie down." Merrill put her hand to her head, feeling feverish, there was more to this than a few new monsters.
"Yeah, me too, I'm sorry, I'm not equipped to understand all this magic stuff!" then, Veronica turned to Elder McNamara and asked, "Elder, I don't understand, what's going on?"
"Some time ago, our scribes noticed an unusual energy signature from the Lucky 38, not long after a light filled the bunker and we awoke to find ourselves here, new landmarks popped up in spaces that were once empty, grass growing in an area where it hadn't even grown before the war. Then I'm hearing something about 'magical anomalies' which confuses me as much as it does anyone else."
"Well, while I'm still completely lost, it helps to see a friendly face." Veronica said, "But that doesn't explain how Boone and I got launched halfway across the Mojave…or Free Marches…or wherever this is now. We were all with the Courier at the Lucky 38 when this happened."
"It was a transport device." Boone said suddenly.
"Remember, the Courier brought a transport device from the Big Empty, it must have messed up when Rex bit it. We may not be the only ones lost."
"I feel as though this is very similar to what happened to us." Fenris said.
Elder McNamara spoke again, "How about we go into the bunker to discuss it. I think you could give us more information."