Please look inside the sub embedded spoilers for possible comments
Peace y'all
Interesting ideas and information. Though if Virgil would be related to the Roman poet that was also included in Dante's Inferno, he would be actually be about 2K years old so quite a bit younger as C, though if indeed related to Eski not per se much less powerful in the end. Though his role was that of a guide at least partially, so that could be interesting.
Thing about other player emerging, though your arguments are valid and if confirmed by a dev also right, but it does feel like a bit of a plot hole if true, since we are more or less told possibly more older vamps as C are around in the wider world and aware. Would they not be noticing the raise of the twins and react to that? (Well it is possible devs just discounted that option to make the story work within it's own limits.
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Concerning the role of MC, yeah it might be he is the straw that breaks the camels back or evens the playing field before our two lovely twins have a heart to heart, so the twins cancel each other out or the one wins he chooses in the end to win. His role might also be very different. I have some weird ideas that also feel a little to convoluted and contrived maybe that depends on quite a few (too many) assumptions, thinking about twins as a whole and some old great Mother rites that are still played out in some Aphrodite rites about Renewal/Rebirth here that might fit.
It would mean devs mix and match even more mythology though and would take quite a walk away from established, which of course they can do since their game.
If you want I can write them out as a spoiler, but I do not really think game will go there per se as such but is a way which could work and also would mean MC was by definition not chosen by accident, which goes a bit against story line and if true might be bad news for MC if those rites are followed literally by devs.
Just one last little thing I will add to this and I will now use the Greek mythology, since it is the one we are all most familiar with likely, though this in a way goes for most older pantheons. The rise of the generation of Zeus was also the rise of some start of order and civilization based on rules, where the gods started to work together even if they still had feuds and own goals that sometimes were opposed to be able to defeat the Titans. So if devs focused more on that first instead of second there may be in the end not two camps but only one. Especially if someone like Zeus or an older equivalent is also playing a game and for his/her reasons want both twins back and at peace. I still am not sure if the name dropping of Tiamat was a red herring, just some world building or important.
Before that there will be some fireworks for sure.