it is about a old royal road fic a kingdom that is under attacks by monsters and a wizards tries to summon hero's in the body's of people but it fails and after a while he uses a prostitute and it succeed and the hero is now in the body of the prostitute the hero then helps solving problems in the kingdom like the starvation and the city walls the orignal body's soul takes over after a while and she meets her old lover a duke it is a lrpg novel please help
are you talking about A Dying World? I don't remember the Duke stuff but the beginning sounds like it.