Be careful about Nightbane as it is PG rated take on Hellraiser/Cabal AKA Nightbreed and has that 70s Marvel Satan comics vibe where they WANT to be a sleazy Eerie magazine but the code stops them from getting there yet they constantly strain at the leash.
Example:
There are some beings who thrive on aguish and torture (a phrase you'll see permutations of quite a bit in descriptions of villains in Paladium writing) and they are called....
WAIT FOR it....
A little longer...
TENSION BUILDS....
the Torturians. Which is like calling a plumber a Pipesmanian or something.
What I'm saying is, for a proper horror feel by which I mean a Straub/Barker feel you may want to rename 40% of everything because the tone will not quite click into place with the subject matter.
But if you want that Son of Satan/Werewolf By Knight/Living Zvumbie/Brother Voodoo/early Ghost Rider feel which I would describe as a truncated corniness made nominally 80s kid safe, then Nightbane works fine as is.
Tonally it's all over the place. There's "blink and you miss it" mature stuff scattered throughout, the later books (after Carella stepped away especially) get more and more fixated on concepts of cosmic balance it can seem, and it suffers from being a Palladium game. That is, the rules for character creation are probably cut-n-paste from another Palladium game... and literally unworkable RAW because of it. But even if they do work, things like party balance and speed of play are a pipe dream, and you'll be -constantly- tracking hit point loss and regeneration among at least one other changing resource pool. It's a mess.
Which, if you're not familiar with Palladium games, has to be seen as a feature rather than a flaw. Palladium was OSR before OSR was a thing, and have basically been tweaking on the same game engine since the 80's (MDC was their last big change, but it doesn't apply to Nightbane). Alternatively, you can gut the system and keep the setting (which even the author admitted to doing for some of his Palladium games), and that's where Palladium's stuff tends to stand out better.
Still, I find it one of the more interesting settings. Nightbane are people who discover they're unique monsters (think Clive Barker's "Nightbreed", an obvious inspiration), trapped in a way against the Nightlords, sorcerer gods from another dimension who want to -slowly- kill all life on Earth for the magical boost they get. One day, the world went without sun for 24 hours, and now authoritarian governments, hate groups, etc. are rising up out of fear (and Nightlord manipulations) to help choke the world in the name of safety. To help the Nightbane are weird alien/angel beings (who may not be as good as they claim), spellcasters and wielders of magical artifacts, rogue vampires, dream lords, psychics, and so on. Meanwhile, the Nightlords have access to evil duplicates, alien monsters, cults, traitors, etc. Scenarios (IME) can be a bit like your standard "Monster of the Week" story, except with more espionage, more monsters, and bigger battles (PCs throwing around energy blasts... or cars... or their own exploding/regenerating head).