Spoiler: Astra
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With much hope and encouragement, Astra says, "A pass code? That's a great idea!"

Although Bruno's suggestion is a little strange. "Uh.. maybe? That seems oddly specific.. and I can't help but think someone else might actually say that..." She grins at the faerie.

"What else could I tell you? Hmm. Well a disguise like theirs would certainly use magic. I don't suppose any of you know how to detect magic auras? It's a fairly simple spell..." Of course this was coming from her, a somewhat more experienced wizard. "If it looks like their entire being is shrouded in an illusion spell, there's almost certainly something to watch out for!"