So, werewolves are pretty popular among horror monsters, so it's only natural I was going to steal them.
However, there's a big problem with converting them to my setting, and I'm not talking about nightmares involving a home invasion by mutant nazis. You see, werewolves transform. While I like taking on challenges that seem physically impossible (like making dragons fly), transformation in a short timeframe is physically impossible.
There's nowhere for the waste heat to go, there isn't enough material for the werewolf body, and they don't have their own titan realm that could magically beam down the required material. It's that simple. Even if they managed to transform, it'd result in an explosion, though probably a much smaller one unless they're actually turning energy into matter.
Anyway, I chose the path of least resistance to solve this problem by simply extending the timeframe to allow for waste heat to dissipate. Now, the problem is that werewolves can't turn back to humans. That's perfectly fine by me but presents several problems.
You see, a fully-transformed werewolf has their human minds left intact, except for the necessary "firmware updates", which is the reason why they unconsciously wag their tails when excited. The only time they go feral is when in grave danger or during full moon, both of which can be mitigated with isolation, usually deep within forests.
Werewolves are upright humanoid creatures with many features that resemble that of the canis lupus lupus. They're stronger than regular humans and have better reflexes, sharper senses, and thicker hide. However, they can still be damaged with regular weapons and are vulnerable to silver and holy water, both of which behave as fast-acting poison when coming into contact with their skin.
They usually form nomadic packs/tribes made up of other werewolves, typically from the same region.
However, while a "completed" werewolf should have no trouble surviving, especially when they have their pack to help them, the transformation is debilitating and energy-intensive, leaving even very fit people incapable of doing much for at least five months. While usually, the first things they get are the sharper eyesight and ears (like actual pointy, fluffy ears), three days in, their stamina and strength remain abysmal until the very end of the transformation.
Also, werewolves are classified as creatures of the night, making them the target of a certain noble family that specializes in monster hunting. While it's true that eventually, Mephistopheles (not to be confuse with yours truly) and his army of cybernetically augmented tax collectors put an end to them, at that point they had been operating for hundreds of years, amassing an enormous amount of information, weapons, connections, and undeclared income.
During that time, how did mid-transformation werewolves survive until they could go off the grid? Now, werewolves usually come from mid-sized to large towns. The tech level and society are basically that of the late-medieval period. Though the existence of demons made some minor distortions to the world, they and their doings are not players in this game.
Keep in mind that while the monster-hunting family's "philosophy" on what they were doing was subject to change from "putting down the sick for the sake of their salvation" to "rip n' tear"; they never even considered not hunting monsters, let alone making peace with them. The same goes for just about every authority figure.