It's just two notes for me.
This is THE broken post.
There’s so much more than this to see (at least, I hope I’m right). That this is not all that there’ll be, I’ll catch the fading light. Though starless skies above my head, this soul can still endure, and make it through the night somehow if I am promised dawn.
— From Winter, ‘Through the Night’
How does magic work in Call of Cthulhu and the mythos in general? A few possibilities:
Yog-Sothoth hypothesis: The Lurker at the Threshold often venerated by eldritch mages is locked away from our reality, but can still interact with it through a few ways. Magic is one of these: the sorcerer becomes a small portal through which the All-In-One can seep into our world and affect change. Every time a spell is cast, the barrier between our universe and Yog-Sothoth deteriorates. No wonder it is so damaging to sanity!
Azathoth hypothesis: Our Universe is but a dream of our creator, the blind idiot god Azathoth. Have you ever heard a sound or have someone say something while you were asleep, and it affected your dream? Well, through learning the arcane language that Azathoth understands, you may do the same thing to his dream i.e. our reality! Better hope you don't overdo it, or you might wake him up and erase us all from existence...
Nyarlathotep hypothesis: Magic isn't real. It's all Nyarlathotep making it look like spells work. He does this because it's funny.