EDIT: Mods, I'm really sorry - I posted in the wrong section. Please move this to the plot section. Thanks! My MC and her friend/partner are, in the beginning of the story, the only two people who underwent a secret government experiment that gave them immortality. They're biologically 16 but age very slowly and will stop in their "twenties." There's rare exceptions to the immortality rule--for example, getting bombed into a million pieces that float in different directions down the river wouldn't be survivable, but something like a gunshot wound would heal/regenerate itself. The experiment happened hundreds of years before the start of the novel, and most of humanity has died off due to major geo/environmental issues. The remaining sliver of humanity, just a few thousand people, live in buildings called "Sanctuaries" scattered across the land, to protect them from the mutated creatures and environmental dangers in the world outside, which humanity no longer has the resources to tame. My MC hates being stuck in the Sanctuary, because 1) she has no one to connect with who's like her, and feels constantly isolated, and 2) she's constantly subject to experiments conducted by the Sanctuary government, due to the fact that they want to figure out how to re-create the immortality cure (since the original experiment labwork was destroyed). Within chapter 3, she discovers the other Experiment kid in the Sanctuary, and finally gets the kindred spirit and companion that she's been longing for up until then. Seemingly her life took a huge spike up for the better. But then, she learns something that prompts them (she and her boyfriend) to escape the Sanctuary, which is extremely high-risk, ASAP. An elevation of the stakes, so to speak. Also, later in the story, she ends up liberating 3-4 other Experiment kids (I have their characters all fleshed out now thanks to y'all!) who were trapped in the fate that she and her boyfriend ran from. After this point, they're able to work together to fight back against the system that's been hunting them down. The thing is, I'm still drawing blanks on what this awful fate would be. I had originally done another thread several weeks ago that involved the stakes somehow involving aliens, but that twisted my plot into a million knots and I'd rather work with something I can deal with. I'm also open-minded at this point on what it could be. Something where, at first, an early level of its operation (what she originally ran away from) is low-key enough that it's possible for the two MCs to help free their new friends from it. But also, something that could be built on as the story evolves, to become something more systematic and large scale. I'm totally open minded on it at this point, open to suggestions, and will give like/rep points to anyone who answers.