Years later, when a child asked about the woman who saved their city, they would point to the night sky and say, "There—see that bright star crossing the black? She’s keeping the rest of us safe." The star would wink, perhaps a reflection, perhaps a truth. Somewhere beyond orbit, Astra kept watch, tethered to a shard that had learned to choose preservation over pruning.

Astra spoke, not with words but with the weight of a comet’s loneliness. She did not want to be the instrument of erasure; she had been a messenger, a safeguard. In ages past, her kind cleansed worlds of entropy. But this city—this ragged place—had a stubborn human chaos Astra had learned to love. The shard listened.

A comet, black as old ink, split the city’s moonless evening. Light fell like glass. Where the fragments struck, time hiccupped—stopping, reversing, skipping—leaving wounds in the fabric of causality. From the impact rose a woman whose eyes held galaxies; she named herself Astra, and she did not belong in their sky.

Before she left, she pressed a cold, luminescent fragment into each Sentinel’s palm—smaller than before, a promise that their memories were real and that, should the shard’s hunger return, they would remember how to argue for mercy. She whispered one human lesson she had learned on their streets: "You make meaning by staying."

Astra revealed the shard’s method: it did not destroy out of malice but out of an algorithm of balance. Worlds born in instability get pruned. The Starshard used probability as pruning shears. If a timeline had too many contradictions, the shard resolved them by subtracting people, events, possibilities. A kindly calculus, but cruel.

End.

Each bore a token from the comet: a shard of its dark crystal fused into their palms. The shard's presence anchored them to time; for each, the world’s erasure left a scar only they could see. The shards bound them to one another, whispering in a chorus that sounded suspiciously like hope.

As the resonator hummed, Mira moved through the chamber stitching small, stubborn facts into the world—birthmarks, small promises, the scent of orange blossoms. Astra stepped forward, placing her palm against the onyx. For a moment, the shard’s light flooded them all with possible lives—endings where they failed, endings where the city folded in on itself, endings where everything was as it had been.