Offspring of NINKAN, which is Sumerian for Queen / Priestess / Lady of Blood, but most commonly known as Lilith.
This is the "Pet" snake of Lilith's right hand. (The Blue Vampiress.) If you had a biological research and development laboratory, where you're responsible for creating hordes of creatures from gestation and beyond, wouldn't you make yourself a two-headed vampire cobra?!
I felt the character needed a creature pet to reinforce her role and demeanor.