This is a few months old, but worth noting:
A photographer and die-hard solar observer has captured absolutely stunning views of a colossal filament of super-hot plasma snaking its way across the surface of the sun.
If you can’t do something with this for your Call of Cthulhu or other horror campaigns then… I dunno. Have a sandwich and get a good night’s sleep, maybe? The campaign – or, more disturbing, background filler – writes itself.
The problem (as I see it) is that there has to be a sense that the inevitable might be delayed by the character’s heroic actions.
It’s kind of hard to evoke that here.
It’s be easier to do a “how would society react to cosmic horror” than actual cosmic horror from this seed.
The interesting thing about this is that you can only see the dang thing with specialized equipment: nothing that a dedicated hobbyist wouldn’t have, but if (say) sun-dholes appeared most people wouldn’t know until they ate enough of the Sun. From there it’s a quick jump to ‘disrupt the ritual, run away, and the slowest ones die.’
We’re sure the sun isn’t a giant egg right? And that some kind of monster isn’t beginning to hatch out? Because if that’s the case it’s going to be really big.