There is a bar. The bar is quite pleasantly outfitted, with booths and tables and a lovely fireplace with couches in front of it. The couches must be quite comfortable, because a young woman is sleeping on one of them as though it were the grandest featherbed. Or perhaps that's just exhaustion. She—and the other woman in this currently otherwise-empty establishment—are both plenty the worse for wear. To an inexperienced eye, it might seem only as if they had been out camping for a while, from the roughness of their clothes, but if you know how to look—that's the sleep of one who's found decent sleep a precious commodity for a long time. And her sister, the one whose eyes you can see—those are the eyes of someone who's found an unanticipated path out of Hell, an unexpected part in the Red Sea.
He looks up and blinks at the unexpected lighting situation, then blinks again at the unexpected decor.
"...I'm hallucinating," he decides. "Lovely. Another class of painkillers down the hole." He rubs his eyes again.
"My biology's mostly the same as baseline, and my few tweaks don't really interfere with that sort of thing, but I don't actually currently have any injuries that require them. Hello and welcome to Milliways, the bar at the end of the universe. Apparently no one has a damn clue which universe is ending but it's apparently been doing so for a damn long time." She jerks a thumb at the window of exploding stars. "This place hijacks doors at random from a wide variety of universes. What's yours like?"
"On the off chance that this is not in fact a hallucination, that's the most interesting thing I've heard in a long time and might actually beat out my intense desire for non-hallucinatory coffee. Um. How does one go about describing one's world?"
"Well, I can tell you that I'm from anno domini nineteen eighty-three and that I object to having to use that phrasing because he's not my lord and that I'm from Earth and that seven years ago the United States of America was overrun by genocidal murderbots," she says, "for instance."
"...Twenty-nine ninety-seven Earth Common Era," he says. "I think that's the same calendar, but while I don't know much about pre-Jump Earth history, I can pretty definitively assert that none of its countries were ever overrun by genocidal murderbots. That seems like the sort of thing that would make it into most summaries alongside Shakespeare and the pyramids."
"...In my universe, there's a recessive gene called the X-Gene that, when manifested, can cause changes dramatic enough and apparently out-of-nowhere enough, since it's recessive, to the child's phenotype, that the class of persons who have two copies are called 'mutants.' Effects of the X-Gene range from white hair to blue skin to fully-functional wings to generation of and control over a personal magnetic field to telepathy."
He regards her for a moment, thoughtful curiosity edged with... something harder to pin down. Compassion, maybe? No, although there's some of that too.
"The strength of the hallucination hypothesis decreases steadily, but if you're not a hallucination, there remains the question of what to do with you. And your murderbot-filled world." He clears his throat. "My name is Admiral Naismith, of the Dendarii Free Mercenary Fleet. How can I help you, ma'am?"
"My sister and I are mutants, and the genocidal murderbots were specifically designed to kill us. We want out. Ideally we would like to come back some day with the resources to turn them into scrap metal, but at this point we'll be happy to settle for being able to survive without having to set guards every night and scrounge for the increasingly small number of places that the Sentinels aren't watching. The Sentinels are the murderbots," she adds.
"I... can definitely offer you somewhere to go," he says. "Several somewheres. I'm actually on my way to my version of Earth right now, and from what I hear it's pretty robust at handling refugees, although your situation might be unusually difficult to explain. The resources to turn the Sentinels into scrap metal... might also be available, but I'm already running a pretty high cost overrun on my last mission; planetary and subplanetary conquests will have to wait until I'm assured of my ability to feed, pay, and equip my people."
"I understand. Back when any of the rest of our family was alive we would have prioritized them over random strangers too." She considers. "If it matters, we can earn our keep; my sister has the magnetism I mentioned, and what it largely comes down to is very good metallokinesis." She points to a cuff on her sister's wrist; it looks to be made of stainless steel. How it got on her wrist is a mystery, since it's flush against the skin and there appears to be no latch. "That used to be coins."
"I'm a telepath. I'm not reading your mind, but I could, or speak to you in your head, or put something there, and with remarkable precision. I've copied languages from people and shared them without touching anything else in there. I can also knock people unconscious or affect their movements without actually touching anything in their minds."
"That's... certainly a special feature," he says cautiously. "Please excuse me if I sound suspicious; I've spent the last six months near-continuously fleeing assassins and the part of me that asks 'what's the most devastating way this could go wrong?' is on permanent high alert these days. I expect you can relate."
"It's just such a... wretched failure of imagination," he says. "People have spent vast stretches of history hating and fearing one another for this or that reason, and the answer is never indiscriminate murder, and there's always some fucking fool who thinks it is, and then smarter, more compassionate people have to clean up their damn mess."
"My... space future... contains a couple of interplanetary empires that have made forays into interplanetary conquest. As motives for killing a lot of people go, greed and pride are both worse than fear. I think what puts your example above the standard case of 'they're terrifying, let's kill them' is how much better it could have gone if the people with visions of peaceful cooperation had got there ahead of the people with murderous robots. I have a deep personal loathing of wasted potential."
"That depends on the alternatives. And on whether you're taking the short view or the long. This is not a popular philosophy among mercenary admirals, but I've always held that the ultimate objective of any combat effort is to achieve peace as efficiently as possible."
"You're right, of course. The problem is how people define peace, because an absence of peace isn't just the presence of active combat. I've heard that there's a difference between a negative peace, which is the absence of violence, and a positive peace, which is the presence of justice, and obviously that's not a bright line, but sometimes you have to choose between one and the other. And some of the real problems start when people decide that things count as an absence of justice that shouldn't."
"You don't do that without learning a thing or two about paranoia. Anyway, since you're the one who can hold the door to the universe not filled with death, it's pretty much on you to decide when to leave, although if it's all the same I think I'll let my sister sleep until it's time to go. She's had a rougher time of it the past few days than I have."
"Well, now you have your choice of... coming with me to the admiral's cabin of my flagship, or waiting and taking your chances on the next sympathetic stranger, I suppose. I can wait a little while myself but I'm irrationally reluctant to try the questionably hallucinatory coffee, so I don't want to make it more than a few hours."
"We'll come with you, I think; she can sleep later if we're really rid of those machines. We've no idea when anyone else will arrive or how interested they would be in letting us in to their universe. And, frankly, you've already made a very good impression. I can wake her now, if you'd rather leave sooner rather than later."
"There are about two hundred habitable planets and stations in the galaxy. You can get from Earth to any of them in a couple of months, tops. Back on my flagship I could easily conjure you up the tourism pamphlets of the top fifty or a hundred most interesting ones, but out here I have fewer resources available."
The gist of it is--they're a terror to fight. Back when there were more than just the two of them, that they knew of, a group of five or so well-trained mutants taking on a much larger group of Sentinels could almost certainly take down several of them before the Sentinels adapted to whatever their powers were--heat against cold, cold against heat, absorbing and mimicing exotic materials. The one saving grace was that Sentinels seemingly couldn't share adaptations between each other. They're built like humans. They move like humans, except when they don't. A baseline Sentinel can be damaged by so many newtons of force especially when applied to these particular areas, but one that's undergone significant adaptation is often different. They adapt to direct uses of power significantly faster than indirect ones. They can't fly, but they do have ranged attacks. They can detect mutants at an ever-increasing range, and will automatically target them over nonmutants, so if one's about to kill some genotypicals flying just into their range and playing keep-away until the original victims have gotten away is a valid, if often lethal, strategy.
"I can think of some things to try on them," says Admiral Naismith. "Some of them I have to rule out because some weapons should not be fired inside the atmosphere of an inhabited planet, but there's plenty more. Do you know how many there are, how wide an area they cover?"
"As of the last time we were able to get any news from the rest of the world--about five years ago--they had covered the entirety of the continental United States and were being sent to Alaska and Hawaii, but had yet to invade any other countries. I wouldn't be surprised if this had changed since then, but I don't know that it has. As to how many there are...according to the numbers as projected six years ago, probably somewhere between one and two hundred million."
"Oh, sure--so could I, probably, given some time and ideally the ability to study various systems of government and how they work and how they're implemented. I suspect the ultimate answer will depend a great deal on factors I can't know right now, though, like what resources exactly will be available at the time and how much infrastructure the Sentinels have co-opted and how much they've straight up destroyed and who's available to run it."