RE: Looking for R-18 slavery dark side novels

#2
I think Ancient Ruins and it's sequel Spells of Old were on here at some point. Didn't find them in a search though so I think they've been taken down so the author could publish them on Amazon.

I've only read a little but somebody suggested this one to me https://royalroadl.com/fiction/11295 (Into the Black) and it seems to have the themes you've mentioned. The main character does buy slaves.

RE: Looking for R-18 slavery dark side novels

#8
Ultimatum of the Nameless God by Brian McGoldrick: A dark horrorish story with elements of LitRPG in it (not much). The first book is more gory while the second book has a lot of smut. Seems to be what you're looking for. Was surprisingly entertaining.

Night Angel series by Brent Weeks: Think an easier to follow version of GoT.

Know you were asking for light novels but these books are pretty good and similar to what you're asking for. Hope you find something!
Interested in a more realistic LitRPG story?
Checkout my story here: https://royalroadl.com/fiction/12090/judgement