Dastardly Sith looking to cause mischief in the galaxy

Welcome aboard.

There's plenty of darksider factions around here, the most famous and largest one being the Blackguard Reborn under Viox Savage. Currently they're facing struggle from the ranks of their own Sith Lords, as their northern borders have defected to the Resurgent Sith Conclave under Darth Malvus, while Viox' heir, Vallius Savage has pretty much annexed Iridonnia for his own. There is also the slight chance, that the Blackguard Reborn might emerge from these events as a reshaped faction.
Then of course there's also the Dark Jedi Order, which is lead by their Empress Maria Shadows, who also dwell within the Dark Side.
And while most of the afore mentioned factions are mostly pure darksider factions, we shouldn't forget the Solenbaran Diarchy, who pretty much is unlike the First Order, the darker side of the Galactic Empire incarnate. Zariel, one of the Diarchs, has already allowed the former followers of Palpatine to form a cult in honor of their former Emperor, who might return one day to rule once more over the galaxy.

And well, then there is of course my faction, the Quarren Dominion. Followers of the Way of the Dark with the grand scheme in mind of destroying the entire galaxy at some point - the everlasting goal, that keeps our Sorcerers of Rhandite tradition thrive. While our domains border the ones of the Jedi, we also face currently an IC rebellion, where the Sorcerers pretty much annihilate those warlords, who have realized that they had become nothing more than puppets within the Prophet's schemes, as our empire has now reached the point, where the games of petty politics are over and the time of terror approaches.

Here's also a brief summary of our mindset if you're interested.
Basically, unlike other Sith factions we do not strife for more power and more unnecessary glory, while ranks are merely in place to remind those beneath us, that the end goal matters more than petty rivalries and the hunger to usurp a higher person. The Sorcerers do not distrust the Sith necessarily, for they are also darksiders, but they do not care for a "Darth" title and hold in general the view, that the Sith's philosophy stands in conflict with their own due to their hunger for more power.
That doesn't mean though that we don't accept defecting Jedi or Sith, who hold the same ideals as we do - after all there are many pathways, which might lead to OUR desired future.

Can't speak for the other factions, as their faction leaders can probably explain in more detail of what they plan, but that would be so far everything I could tell you.


edit: Sorry for the many edits, but I wanted to give an overall information with a lot of factions, that might fit your theme, so if I forgot some factions like certain aspects of the First Order, where darksiders try to influence here and there the fate of the current grandest faction of the universe in terms of territory and fleet power or other factions, where darksiders currently operate, I would like to apologize.
Even the almighty Prophet doesn't know everything OOC. ^-^'

Just to give a general gist, as C'thyl mentioned, the First Order is the considered to be the dominate force in the galaxy. Built upon about seven years of RL work and a lot of luck.

Right now, they have two, technically, three force organizations (last one is a secret known only to the Emperor and the Director of II). The Knights of Ren who serve as the Swords of the reborn Empire and one among their rank gave the Emperor the first of offspring, a set of twins, Octavian and Fiora. They have a bit of a creative license as we know little of the Canon's Ren, but you can ask Harnan Ren or Soku Ren for any questions. The latter is promised to join their ranks. The former, the son, is to join the Imperial Knights, renewed some years ago (prior to 2013) by Cade Fel and the revived Fel Empire. When he disappeared, they eventually found a new person to lead them and that was Nicademus. They are led by the new Empress Faina (but she is currently MIA due to RL), so they are led by Brock Ferrum as Steward. The last of our force organizations is the SSE, Specialis Secretus Executum, led by Dread Lord Havok , a secret arm of Imperial Intelligence that is likely where one will find more darkers.

Otherwise, darksiders are welcomed, despite the presence of the Imperial Knights and the Knights of Ren who have a common cause with who they dislike when it's not each other. No need to choose an sub-organization to join in, could always find a career with science, government, military, and such of the Empire.

Hey, if you want some cloak and dagger, I think the FO and the Corellians are going to be getting around to a cold-war type spy thing at some point.
I look forward to reading about Wolfe's pursuit of the death of the force! Your character seems to have a philosophical depth that I think would be fun to interact with Havok at some point. if you want an example of Havok's philosophical musings you can find them here. Don't be a stranger! PM if you ever what to philosophize with a sith!