<Snipped quote by ArenaSnow>
If your character is that, then any individual who hears knows a the fact about Astiorth, plan and simple. The only reason they have for not taking your word for it is that you are a demon but there no point in really mistrust ingredients a demon pointing out another demon. Another thing is that only holy figures could detect his aura, by all accounts, you character is technically not holy. You are a mage, not a cleric, or a paladin, or a priestess. Also, while it depends on a personal view, demons are not holt either, that is why it is called demonic. But it is what it is.
My only goal was to use these items to set up a dynamic that would cause the group to look athrough each other in a new liget that almost forces them to actually look at each other as individuals and not as mere demons and humans, but now there is no point. As for the demon lord, all the was given is that he can talk through a host, it said nothing about his abilities being capable utilization through a mortal human body.
Again, I'm seeing these items as a waste of space and would have much had rather spent the time making items to benefit him in combat I stead of using trust to rely on his team to make up for his lack of versatility in a fight.
Since the human heard you, there is also no reason he wouldn't tell the others.
I will not debate the other points because I want to know this first: Where exactly does Kolonis identify Astiorth? When does she say anything at all aloud about him? When, indeed, does she directly acknowledge that he specifically exists? And if she never mentioned Astiorth, how is everyone else about to figure it out? Even Remus at full strength and in his true form isn't a mind reader.
Edit: And before I forget, please address my point regarding being able to recognize him if he doesn't change the appearance of his human form frequently. Does it change or does the amulet simply do a 1:1 conversion from what he looks like as a demon to his human equivalent? Because if it's the latter, he's immediately detectable by Remus and Kolonis due to the fact the three of them, based on your bio, would have had at least some interaction over the past couple thousand years.