[/spoiler]
Well, you can let Volo put an ice pick in your eye, you can let Araj turn your blood explosive, etc. If someone wants to be a vampire spawn because they're convinced they'll be able to talk Astarion into turning them into a full vamp later, or just didn't think this through because powah, they should be able to do it.
It could also be an option for a Durge who [spoiler]loses a duel with Orin. Or non repentant Durge who chooses to destroy the brain. Make some dice rolls in the ending, maybe at least keep your sanity if Astarion's control wins over Bhaal's.
No, sorry, what you are writing in your spoiler tags doesn't make sense at all lore wise -
a vampire is not more powerful than a god, ascended or not. If you choose Bhaal, then you are tied to him and he should even intervene, if Astarion tries to make you a sawn. After al, you are crucial to his success.
ANd I'm not talking how unhealthy a relationship (romance or friendship) with Astarion would be for anyone else, since you can't disobey him. Let's face it: the chances of him making you a vampire (promise or not) is slim at best. Ascended Astarion is a different person - vampires in DnD are always evil. Astarion the spawn has room to grow, Astarion the vampire ... not so much.
But as Isaid: I'm not against it - more options are always good. I just laid down my personal thoughts on the matter. So all is good.
