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Recently our group started to delve into the misteries of astral space, sight and the like, and every time we touch the topic a question arises.
In the modul "Mists of Betrayal" at one point Brenula investigates the group members if they are corrupted by an horror using the medal in her neck. It says on the 24. page, that with astral sight, the amulet can be spotted as being magical, with a DN 18 which is the talisman's spell defense. (Aside from the fact that everything is up to the GM) is it consistent with the game rules? On one hand if I use astral perception I always see if something is magical (because it "emits light"). On the other hand, if Brenula's astral imprint hides the amulet's (can it in this case? I think not, she hasnt swallowed it or something), than the DN should be Brenula's Spell Defense (and an excellent success, pg 111 players guide).

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I've always seen it as you can see any items or people with a spell defense under the astral sight roll with a minimum of 10 to see anything in the astral plane at all.

It is possible that some mages have developed new spells or abilities that could make that harder or easier to do though.

In short:
You can normally see into astral space with a result of 6 (modified by Astral Region as per the table on p. 111 Player's Guide), and can then see the imprint ("aura") of anything magical or alive, So you could spot the amulet as magical with that.

Exception: If the magic used is actually meant to conceal something, you normally need to beat Spell Defense, of the strength of the magical effect. For example, if an illusion spell makes you invisible, you can't be seen in astral space, except if the astral sight tests beats whatever result the spell requires.
Addition: With just a 6, you can't tell what something does; analyzing things requires studying the pattern, which requires beating Spell Defense. A 6 allows you to see something, but not to know all about it.
Addition to the addition: Of course that also means that you can see the aura of things that don't really do much. You can weave true elements into something without causing any effect, but such things would show a mgical aura.