The Devil in the Details
This was a very interesting read. I am enjoying the plot so far, and Asmodeus is defined enough as a protagonist that he really does provide a contrast to the other characters. Parts reminded me of Neil Gaiman in a way.
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There are some really cool ideas. Such as seeing Asmodeus being summoned, and how it appears through his perspective. You never see that in media, and it really stands out. Particularly how the demons see how humans see the other world, and how their ideas formed religion and similar ideas. Having Thor be an antagonistic figure is a nice touch; the proliferation of the MCU means everyone pictures Liam Hemsworth's brother. This Thor feels different enough to be his own character.
My criticisms lie mostly in descriptions, and how action scenes are written. Don't be afraid to be poetic with the adjectives. A good exercise to describe someone/something without stating who/what you're referring to. I'd recommend reading works that can help (Stephen King describes characters like no other person - they remain in your head forever.) The action scenes could use a sense of dynamism, so we really see how Asmodeus is dealing with these incidents.
But yeah, looking forward to the next chapter. You're really onto something here.