Great. Here's a link to a quick overview of the factions...

[url]https://drakkenheim.fandom.com/wiki/The_Factions[/url]

And here's a deeper look in video form if you prefer (you only need to watch up to the 6:12 mark)

[url]https://www.youtube.com/watch?v=QywdY0dvfRU[/url]

Here's a quick rundown of each faction and their corresponding leader. I also threw in their stated assassination difficulty if that helps you...

Hooded Lanterns: Elias Drexel (easier to kill)
Followers of the Falling Fire: Lucretia Mathias (easier-neutral to kill)
The Silver Order: Theodore Marshal (difficult to kill)
The Queen's Men: The Queen of Thieves (difficult to kill)
The Amethyst Academy: Eldrick Runeweaver (neutral to kill)