If you want some horror FF, try the ones by Steven Hand: Dead of Night (40), Legend of the Shadow Warriors (44), and Moon Runner (48).
In
Dead of Night you're a "demon stalker" (and dedicated river-barge passenger). Your parents go missing during a demonic invasion.
In
Legend of the Shadow Warriors you're a war veteran charged with hunting down the shadowy fighters of the title (no relation to Lo Wang), you meet ancient gods and pumpkin-heads (and a determined tax collector).
In
Moonrunner you're a detective/bounty hunter searching for a escaped war criminal in a shit-hole city, it's pretty cool. The ending isn't what you'd expect in a series like this.
These three books are written by Steven Hand, not Ian Livingstone and Steve Jackson. They're set in the 'Old World,' a part of Titan which feels very different to Allansia, the most common FF location. Allansia is an adventure-filled wilderness, with orcs, elves, dwarves, huge grassy plains, verdant forests and struggling city states.
The Old World has developed cities, and settled nation states, and the evils you are like to find include ghosts, demons, vampires, werewolves, etc. Technology can seem more advanced (you can ride a stagecoach, for instance) but in some ways also medieval. There's no guns, I don't think. The Old World is decadent, crumbling, and gothic.
Anyway, read these three books if you can, they're a good horror-trilogy. Hand was planning a fourth book, but it was cancelled when FF stopped publishing books, around 1992.