The vampyrs or living hemophagues/blood-drinkers and their "blood farms" with prisoners... today they may be very problematic because today in internet some "urban legends" tell horrible things, very horrible, worse than the trafic of human organs, about "adrenochrome", a drug to keep young by means of dreadful means. Today the "vampire camarilla" could be used as an allegory of the deep state by some DMs.
Forlon is perfect if you want a game about to clean a zone to bluild your stronghold, something like Conan Exiles or State of Decay 2. Goblyns should be faes, not undead, because without variety of monster types then the players become specialist of undead-slaying. A retcon of the goblyns would make these to become ashes when they die (or something like a sand castle destroyed by the water), to avoid gore, and then Forlon would be better for a family-friend horror story, or game. Maybe here we should add "digievolutions" or mutant version of the goblyns.
Forlon is too linked to the darklord. It would be interesting a war between goblyn defenders and an invasion of vrylokas, or the wererats, or werevermins. These "unwated guests" would be wellcome, and helped, by Rual, the ghost, only to cause suffering against Tristen.
Or somebody searchs the druids for a reincarnation spell. This works partially, but the "patient" become a twister version of the wilders, the humanoids with plant traits. It is a good ally, but they suffer when the goblyns destroy the forests. Later this "wilder" is killed, but reincarnated into other "pod", and the original corpse is used for reverse ingenering to create a new plant monster, this time working as a parasite.