Boundary Instrument

This is not a story about infinite time travel, but an epic about limited salvation. In the shadow of the multiverse, there is an ancient creation called the "World Instrument" - it is not a book, but an "interdimensional civilization observation and maintenance system" that records the complete archives of thirty-six endangered worlds. When a civilization collapses due to its own mistakes, external disasters, or conceptual pollution, "Boundary Instruments" will wake up the "observers" and make the final choice: repair or archive.