Temporal Nonlinearity
Temporal nonlinearity is the rewriting of a population’s lived history when its species can no longer continue. The Timeless built this safeguard into Elysium, the isolated shard of bespoke spacetime where they quarantined sapient civilizations. They did not want those civilizations to exterminate themselves. Why they wanted to preserve their prisoners remains inscrutable.
Each prime species has its own reset lineage: the population whose continuity the safeguard tracks. These lineages share an inhabited Elysium. They are not separate worlds reserved for one species each. People can live in mixed settlements, migrate, conduct diplomacy, and build interspecies institutions.
When a prime species can no longer continue, a reset rewrites its lineage’s lived history. Other species may appear in that rewritten history without their own prime lineages being reset. As a result, the same encounter, settlement, or person can have incompatible histories across lineages. Neither account automatically becomes the universal view from outside them.
The histories that remain possible but unrealized do not contain alternate civilizations simultaneously living their own lives. They form a continuum of possibilities around each lived history. The Aetheric Field can interact directly with sapient minds; it monitors both these possibilities and the population continuity it was built to preserve.
Humanity tends to reach destruction quickly because its institutions repeatedly reward reckless acceleration, competitive deployment, and the use of technologies and resources whose costs can be pushed onto others. Other species may sustain longer stretches of history between resets. Their histories have produced different ways to manage risk, provide backups, distribute obligations, allow dissent, and preserve life; cooperation is not an innate species trait. Ratfolk societies offer examples of both hard-won precaution and the ways protective institutions can become paternalistic.
The field also has some ability to predict events, a side effect of its pervasiveness and its inherent capacity to process information. Visions of the future accessed through the Aether are likely extrapolations from the timeline, not prophecies.
A reset does not necessarily remove every influence of an earlier history, nor does living one possibility make all others cease to matter. Strong patterns of thought and meaning can recur, interfere with the present, or gain persistence across resets. This does not give people in the next iteration ordinary memories of what came before. Repeated symbols, relationships, institutions, and apparent spirits may therefore be evidence of pressure from the Aetheric Field. Their recurrence does not prove that two characters are the same person or that a previous history has been restored.