Somewhere Beyond the Sea (The Gaslight District X Bioshock! Male Reader)

Rapture. It had been the dream of salvation - a haven where man would not be held back by petty morality or boorish governments. A city beneath the sea to wait out the end of humanity. But that dream became a nightmare as the city was consumed with madness and nightmarish mutation. Rapture was left forgotten, to rot and rust away beneath the waves as the world above carried on.
But that world too is gone now. In its place is the Gaslight District, where the last vestiges of humanity are left to rot and sin for eternity.

Two cities left to rot under their own follies and two figures connecting them together. A human who is feared like a monster... and a human who was turned into a monster.