I don't understand why you're so insistent on without warning busting into a Wizard's place. Even if they are primarily a mind wizard walking into a Wizard's place of power without telling them is a good way for bad things to immediately happen. Never mind the chances of immediate Friendly Fire because we are somewhere were not supposed to be. Never mind the fact there might be wards that can directly detect our presence even through anonymity through propriety. What makes you think busting into someone's place of business without telling them is a good idea?
Its a club thats open to the public.
Its not a sanctum, its not a wizard's home. Its been characterized as itself being a place of power, which implies there's a Dragons Nest under it, but as far as we know its a place of business, which is why people like Adkins can make offers to buy it.
There's potentially hundreds of people at risk just in the club alone, and thousands that are potentially in the line of fire if/when this shit leaks out of the target building and into the local neighborhood. Or the water supply.
That sort of risk profile justifies precipitate action IC.
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We have literally evaded the notice of high Summer Fae and the Archive in the heart of Avalon with
Anonymity Through Propriety. Those are Queen Titania's defenses.
I am reasonably sure that it would suffice to let us walk into a club run by a minor mage largely unnoticed.
I mean, terrorists generally think what they're trying to do will work and it rarely does (even in the cases where the actual act works out, it rarely has the desired consequences).
I'm not really sold on Sandra being all that dangerous here in this context. She is working with sub-par minions on a plan that is compared to IRL examples unlikely to work.
My best guess is still that this is a distraction and we should focus on stopping her actually dangerous plan.
1) Sandra Marling is not your garden-tier disaffected youth with a nihilist manifesto and a grudge against society.
She presumably did not invest apparent months of effort in recruiting a street chemist, murder multiple people and enthrall their only kid for funding in order to just faff around. Either we're taking her seriously or we're not.
And if we're not taking her seriously about her intentions towards Xanadu, I can see no justification to take her threat towards Vegas itself seriously.
2) Prior to Molly showing up less than 24 hours ago, less than a handfull of people in Las Vegas even knew Sandra was here.
She was entirely successful in avoiding attention.
Supernaturals knew something was up, but had no idea who was orchestrating it.
Distraction makes no sense, because a mass murder attack on this scale on a supernatural hangout is announcing her presence with words of fire in the sky.
PS
I just remembered that Arlene called Club Xanadu a place of power.
"You'll have to ask them," Arlene shrugs. "All I know is they are not looking to found a casino, the land is protected and it is too high profile to set up a less regulated establishment. There is one thing that binds the Xanadu and the Preserve together, both are places of power. I can think of many things for which such a place could be used, most liable to get everyone involved killed."
Sudden wild theory:
It could be that Sandra has been poisoning a bunch of Dragons Nests in Vegas as part of ritual prep, and the current attack on Xanadu is simply designed to be another step.
Unfortunately, we cant tell, because we dont have Essence-Dissecting Stare.