Ka En Ankh Nereru

Ka-En-Ankh-Nereru, according to a Carol Rose encyclopedia of monsters and giants, is a cosmic serpent who's body stretches through the total darkness of the night skies. This is lore found in the Book of the Coming Forth into Day.

At first it may appear that Ka En Ankh Nereru is an analog of Apep the demon serpent of the night sky but if blackdrago.com explains that idea away.

From blackdrago

• a creature of the wurm species
• Ka En Ankh Nereru is a cosmic serpent who covers the night sky. Unlike Apep this dragon or serpent does not fight the sun god Ra, but rather allows or assists Ra in rejuvenating himself so that he may make a new sun rise in the morning.

Being of the wurm species is interesting. Again from blackdrago.

• Also known as Guivre, Worm, and Wyrm. These dragons are completely limbless, leaving no legs nor wings for them. However, they are usually huge serpentile creatures with thick bodies.
• Most portrayal of these creatures hold a snake like head and body type. However many have begun portraying them with wedge shaped heads.

The wedge shaped head could likely be incorporated into the mystery of the Seth animal mask which is of a shape not well understood except that it could be some type of jungle Aardvark.

Someone with a little imagination could connect Ka En Ankh Nereru dragon or serpent to the dark rift that covers the night skies.

Otherwise someone might connect Worm Wood of the biblical prophecies to Ka En Ankh Nereru somehow.

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Resource

http://www.blackdrago.com/types.htm#wurm

The Serene Dragon - other serpents and dragons in Egypt