Crossover Records From the Void (Halo X ARPeggio of Blue Steel, with elements from Kancolle and Azur Lane)

The Fleet of Fog. Legendary figures, the last of those who bore Shipsouls, vanished into the mists of history, to be forgotten, their service drowned in an endless sea.

Until a single facility buried underneath Mars emits a ping that the nascent UNSC traces.