These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fridge Brilliance: Magnus foresaw the end of the world loooong before anyone else did, and, vainly, built 5 Weapons for humanity to wield to attempt to avert it. Yet when he looked into the future, he didn't see them being used. Of course he didn't. Because fate told him they wouldn't be used. But the character's aren't bound by fate at all, and on top of that, none of the PCs are human either, and thus the weapons might actually be used by them.
Why did Circe, a seer of the past, present, and future, react negatively to the PCs arriving? Because she didn't see them coming!