There can be foundational truth that nobody mentions...

The Prophet book on fallen angels does what Murray does: strikingly reminds that the Bible depicts two lines, good and evil, light and darkness, Kingdom of God and Kingdom of Satan, Seth and Cain, good angels and fallen angels, etc. This is central and it doesn't clash with but actually gives insight into orthodox biblical doctrine. It is subject matter that kind of rides above (and undergirds) all the basic doctrinal points you find in a confession like the Westminster Confession of Faith. So it can be totally unremarked upon by systematic theologians; even rejected, for whatever reasons.

The Bible throughout tells this story and depicts these stark realities and it gives numerous different names for each side, which can confuse it all, or veil the simplicity of it. For instance devil has many different names and descriptions throughout the Bible, yet it is the same force that is being depicted.

Path of righteousness vs. path of destruction.

One area of hardcore biblical doctrine the subject of fallen angels and 'seed of the serpent' casts light on is reprobation. I've come to the conclusion before via the typical pondering and 'narrowing down' philosophical/theological reasoning that one engages in once one gets intitiated into these doctrinal truths that reprobates may not even be living souls. They may be like robots, in a sense. Dangerous, real in the effect of their evil and violent deeds and desires, yet robotic. Work teaching teaches this too. Living dead. Mouravieff writes of pre-Adamites and Adamites (as does Murray and also early Calvinists) and demonstrates the difference using the enneagram symbol showing that each type has a totally different inner 'soul DNA', if you will.

But hell is real, potentially, for everybody, because developing real consciousnes, will, and understanding (real being) requires there be real consequences for not doing that. It's a battlefield. At first you're unconscious in the midst of it, a total victim (and participant by default). Then you awaken. Then ideally you die. Then you are reborn. Then you're free. All this happening in the context of spiritual war and crossfire and slavery and prison and influences from above and stupidity and hell within our own beings needing to be conquered as well...