i don't know if you've read the book but it's def worth a read

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Fantasy Sylthos AU request for @sylviesathos
                                        ↳ N e v e r w h e r e
 

Under the streets of Paris there’s a place most people could never even dream of. A city of monsters and saints, murderers and angels, knights in armour and beautiful girls in black velvet. This is the city of the people who have fallen between the cracks.

Olivier d’Athos is a plain man with a dark past, good heart & an ordinary life that is changed forever a day he stops to help a girl he finds bleeding on a Paris sidewalk. From that moment forward, he is propelled into a world he never imagined existed – a dark subculture flourishing in abandoned subway stations and sewer tunnels below the city – a world far stranger and more dangerous than the only one he has ever known..