Author's Note: Apologies for the messy organization. This is a direct transcription of my own notes, written in short-hand.
Eitr The liquid substance of life, (quintessence), that roughly translates to snake venom in jotun. Jormungandr is said to drip with it. This is the same reason potions often cannot be portioned without losing efficacy?
World Serpent, Io, Asgorath Balance, magic personification. Sarukh would forsake divine and adopt the arcane, leading to the disbanding of World Serpent, and the fall of their empire. One of the original names for the world serpent was Mok'slyk and the Yuan-Ti (inheritors of Sarukh) would go on to call one of their deities Merrshaulk. The name being I suspect a bastardization of the previous World Serpent's Mok'slyk, and would stand to reason why it has been that some scholars suspected an association with asmodeus, when in reference to Mok'slyk sharing insights with "Vecna" from Mordenkainen's far-off home world.
Serpent of Chaos The greater balance of everything, snake eating snake. Ouroboros. Or, the union/transference of chaos into order. See Jotun & Mulhorandi: Maat & Ma'at; Jörmungandr & Apep.
The Netherese did much the same with Karsuss, favoring too strongly the arcane. History repeats. And from where did they get their knowledge? The nether scrolls, tablets of magic written on golden scales of the world serpent. Ideas written upon the Form.
A repeated pattern of needing to incorporate, not conquer, the shadow--the serpent. Command with respect.
And now there are these serpent dualities present on multiple dimensions.
Jazirian (Qotal, Magic) and Asmodeus (Ahriman, Magic).
Balance and Scalykinds Asgorath (Io, Ubtao) and Dendar, the Night Serpent. Positive, Negative.
See the same reflected in alchemical symbology. There is the still, the bodily, the dark. There is the combustible, active, and light. Then there is the mediator in between. Salt, Sulfur, and Mercury.
Chessentan goddess Hera claims that the snake god couple (nameless) are the progenitors of all the gods. Creator race reference?
Marduk forms the world from the parts of defeated Tiamat's body. Tiamat, primordial water serpent of chaos, creation, potential being. Younger gods feared Abzu didn't like them, so locked/killed and buried him away in a mountain. So Tiamat creates 11 (but 10 maybe, because of the 5 chromo's and 5 metals?) monsters. She also gives "Tablets of Destiny" to her child/new lover. But Anu/Marduk comes in and saves the day, dividing her up and creating territories for those who agreed to name him king, for doing so.
Abzu = Abazur [?]: deep water (as in underground, and fresh; versus tiamat's that was salty and visible). Thalatte (thalassic) is another name for tiamat, having ocean association. Abzul is sumerian tiamat's husband. So abazur is tiamat's consort?! Said to have "poison instead of blood". Interesting reference to Eitr here, perhaps, as potent lifeforce, but also poison, as with Jorgmungandr.
Not to mention the spirit of Vanessa LoBue, her study of infants associating fear & attention with snakes, when upset adults are nearby. They look at the snake.
Snake = Attention = Consciousness = --- Magic.