#..sort of

BONUS: Remnant obviously resembles a slugcat, and they are sort of a slugcat ancestor! The genomes of the pipe slugs slugcats evolved from had remnant DNA as well as the simple tool-worm base that ancients used for many creatures. The blueprints were present in the modified organisms, and over several generations and mutations began to express themselves once more. Anyway…

To start, the Remnant is living with their family in an idyllic natural landscape much like survivor and monk at the beginning of their campaigns. The incident kickstarting their journey would be them wandering off from their kin and- gameplay starts here- getting lured off by something interesting, before the wall closes quickly behind them and the player realizes they have been trapped. They find themselves in a crate lined with wet plant matter, which gets shaken and turned around for a bit before settling down. It continues with a gentler rattling and remnant is clearly being taken somewhere, but the game acts like you're in a den and, once you've eaten the food set out for you in there, you sleep.

You are woken when the train carrying you crashes. You are able to escape and wind up in a light drizzle. Numerous overseers, some purple and others seafoam green, follow you around. The artificial, dilapidated surroundings are alien to the remnant.

During the first cycle an overseer will direct you to the nearest den, but you don’t have a rain timer until the first time you hibernate. You’ve never experienced rain like this before, after all.

The fact is that the remnant and their family are primal fauna, from the old world before bioengineering and iterators. They have spent their whole lives in a carefully controlled environment, maintained at first by ancients and then the systems the ancients left behind. The mass ascension happened, and nobody really knew what to do with these creatures- depending on the species, animals in captivity were generally released to fend for themselves or set for years of being maintained by machines scheduled in advanced, automated to care for them.

Remnant is taken when the iterator Ink Stained Palms orders a specimen of one relatively hardy species to study and potentially have the rest delivered to their regions. Something goes wrong- their delivery is sabotaged by their semi-active former senior, Calls To Stony Skies. And out Remnant goes into an alien land, with each of the two rival iterators trying to lure or force it to go to them.

This generally takes the form of projections like Iggy uses to get the slugcats to Moon, though it’s two different kinds of overseer guiding you in opposite directions at the same time. There may also be introduced environmental hazards- some of the chases in Little Nightmares come to mind- to corral you toward wherever the iterator causing it wants you to go.

ISP was the one who was getting the remnant delivered to her facility. They’re a bioengineer interested in long-term ecosystem restoration. It’s come to believe there’s a natural ‘balance’ to the world that could, in time, let living things leave the cycle of their own accord if it was realigned properly.

CTSS is in a condition not unlike spearmaster moon, though his decline has been steadier and over a longer period of time. They’ve been replaced by another iterator as group senior, and derailed your journey in the hopes of using a rare animal as collateral to get ISP’s help. Watching the remnant’s struggle to survive, however, he ends up very attached to it and can’t bring himself to kill it as he originally planned to.

Though they might want to, CTSS can’t save the remnant from a more insidious fate. The air, the soil, the water itself is toxic to you, whose kind has lived countless generations shielded from the heavy metal byproducts of industry and the artificial metabolisms of those great boxes in the sky. Ascension is an option, but so is going to ISP, whose body itself possesses a complex with artificial environments much like the one you began in. It can’t protect the remnant fully, but it can offer them a longer life. There are multiple endings to the campaign, based on the order you visit the iterators in.