OOC:
If you guys need a refresher, here is the conversation that ultimately sent you here:
https://gamersplane.com/forums/thread/31929/?p=1555578#p1555578
EDIT: The teal-deer is that...
1.
Lady Blackridge offered you 10 gold coins a piece to bring Astalor to her. One way or another. Your legal authority to apprehend or kill him is... basically non-existent (you're no official agents or authority of Gondor), UNLESS you have proof of crimes.
And while that still wouldn't actually give you any sort of authority (unless it's an act in self defense), it would seem to be an ameliorating circumstance to... whatever happens afterward.
2. No authority of Gondor - or any other nation - knows you're out here looking for him/have found him/nor may ever know you have found him nor what you do with him. All the witnesses here are... people of dubious alliances at best, and, if they don't act against you and whatever you do? Are they gonna go run and tell anyone with any authority over you? Are they gonna go run and tell Gondor?
3. You have a letter that he's printed in the black speech. You have proof of dark magic rituals being practiced on his boat (where you witnessed he had imprisoned a tormented spirit). There was an empty, filthy coffin in his garage. You've witnessed him practicing sorcery invoking the Black Speech. You just witnessed him kill a man.
Other things you know of Astalor is that he has kidnapped the children of an official of Gondor, in an attempt to coerce that person... whom also, you know, happens to be looking for a Palantir (purportedly in service to The Free Peoples of Middle Earth). You also now know Astalor is an agent of The Enemy - invoking Morgoth, which Lady B said she's waging her war against.
So...
These are the things I would be thinking about and the questions I'd be asking myself as a character.
Just wanted to bring up all of this for you to consider, before deciding on your next action, as I figure a lot of this has maybe been lost over IRL time.
Which, btw, I am totally good with you all deliberating at length ooc. As your characters have had ample time to discuss this in the past. (And probably would have.) It just didn't absolutely need to happen till now. So we can say that you've already had the discussion you should have now.
And lastly, perhaps, just because something invokes Shadow doesn't mean it's Evil, or that your character is Evil, it just means that in this world where there is a very real battle between Good and Evil being waged in the hearts and minds of Men, that killing him now with no legal authority and while he is unarmed absolutely blurs the lines between what is Good and what is Evil and that makes it harder to fight the War and/or that doing what it takes to win that War might destroy you.
What is Good?
What is Evil?
What is RIGHT?
And what burden is your character willing to shoulder, so that others may not have to suffer?