Then why are you voting to let her go? All of those with the exception of adventurers are as likely to come as any other option, if not more.
Also, you know what? There was an order of necromancers that was busted just some time ago. What are the odds that one of them may flee to this city and be captured? What will happen then when the priestess will be found "right" if she insists there are other necromancers around?
Then we would have probably stunted our developments just for having less breathing room for our actions.
By the way, if she survives, the church will also discover that the artefact she had with her was stolen, and that's something very specific to lose considering how many necromancer are now wandering around.
The only way to completely avoid that is if we take her body with us and make her disappear, even if just killing her will still stall things for some time.
Because the death of the priestess will surely cause a reaction, but if she survived, she can only say that she attacked the "villain" who was passing by, but he (she) beat her unconscious and took her things. I suspect that half of the adventurers would have done the same in our place. In fact, in this case, she will testify against herself. I am not afraid to take the artefact, since we also take the rest of her valuables as reparations. And for the reasons mentioned above, the necromancer hardly left her alive, and there is no evidence of participation of necromancers. Given the position of the Church in the city, her story is likely to raise a lot of doubt, and she doesn't look rich enough to pay adventurers to find us.
And I don't think her absence will not cause a reaction within one turn (two months), so it doesn't matter anyway.
I would have been more receptive to the idea of killing her if she had been competent, but we had the advantage both in battle and in conversation. As it is now, this is not worth the potential problems.
Ok then, thanks for the reminder, but admittedly it does precisely answer the question on my mind due to me not wording it properly. While we do know necromancers are considered evil and crazy due to the magic they use, the main question I had was primarily speaking what is that makes a necromancer distinct from others in society behavior wise? While we can know people can tell who are necromancer"s by them using a lot of negative energy, the necromantic constructs around them or by them being visible insane, what behavior"s are clues that the person is a potential necromancer if you cannot detect any negative energy on them and you never see them use necromantic constructs before?
Perhaps this is a strange attitude towards death and corpses, aggressiveness towards the living and a tendency to isolation, but these are rather indirect signs. There seems to be no other commonly known indication.
If we decide to take the body, it would potentially give us the option to pose as an Acolyte of Luciana, if we ever feel like the situation calls for that and believe that it might help us, as we would perhaps have access to a uniform set of a Lucianan Acolyte (but then again, the fight may have left the garb of the priestess unusable for one reason or another).
Do we need this? Even if the clothes survived and fit Veсna (which is unlikely, since the priestess was described as low), the status of the apprentice in the Tower seems more reliable, and there is no chance that we will be revealed. In addition, our knowledge of religion seems to be very meagre, and we cannot use the magic of the priests, so this is a bad disguise anyway.