Isekai where humans are the slaves

So... do you know some in which humans are the slaves? 

nn.... kinda cliche, but okay 

It is called 'The Dungeon Master', try reading it on merakiscans (if you didn't read it before) 

I know this one, in it anyone can be a slave if they are not strong enough 

No names of the top of my head, I know I have seen a bunch of series where humans are rules over by the traditional uber-monsters like vampires and werewolves. 

Holy crap. I haven't read that one in such a long time that I forgot about its existence.

Thanks for the recommendation! 

Got rerouted to mrcomic... MR is having a redemption arc. You might want to try another sauce. 

In most series that have slavery they seem to be willing to enslave anyone regardless of race, just often with certain groups being preferred due to market demands.