ah but this is not Anne Rice!
Perhaps she just wants a DJ...... ok she doesn't want a DJ but she may just want to toy with the MC.
Peace
I don't have the vampire pedigree in reference to the lore but I do have a bit of knowledge when it comes to mythology. I may be reading something into the storyline that isn't there but I believe that LikesBlonds has thrown us a bone in reguard to the identity of the creature from the black lagoon.
I am aware of the expectation of it being Ereshkgal from ancient Sumerian lore, but I want to throw out another option. One that frank through his babbling may have reveled when he spoke of Merrick. himself, Marcus, and then Ophelia. It seems to show a definitive hierarchy, even the MC commented on that very possibility... So who is Ophelia.
Ophelia or more correctly Ophalia was the goddess of the other people talking about misfits. those castigated or shunned. the Goddess of sorrows, time, rivers and rain. She also has powers of transformation through the act of drowning. and her colors are both blue and blackish with green tints in her appearance. These colors were found when looking at this creature. It may be coincidence, or maybe not.
Both Merrick and Frank were seen in great distress having their minds totally skewed saying the same thing drip, drip, drip talking about her watery realm. I see Ophalia as the progenitor of the Nos clan and I see her created as a Methuselah. Bad to the bone but not to the level of Vision Girl. The fact that MC had the vision of both Laurie and Shannon in the water and somehow is worried about Laurie drowning. The very means by which Ophalia transforms her victims is also too much of a coincidence.
Just some thing to think over and comment on it if you would I would like to know if I'm drinking the Kool-aide or not.