@Vhaldez -- if you are trying to become the strongest Vampire in the FR you don't want Halsin because that's a path to remove this thing. The thing that grants you powers. And isn't that what matters? Power? Authority? (and besides his log books tell you he's just guessing)
Mind you, I'm just roleplaying here (and going off my own hallucination that Larian confirmed we can become a Werewolf and Vampire somewhere before EA). There is no ingame way to convey to Astarion in Act 1 that you are interested in becoming a full vampire yourself, nor should there be. The tadpole and what boils down to Astarion's (and Helia's) side quest content are unrelated. What's more, if I was right and we can become a Vampire / Werewolf, does that mean origin characters can all become it as well? What about Astarion who is already a Vampire or Helia who is a Werewolf? 🤔
Back on topic; Nothing communicates to the player that the tadpole is a consequence free power-gaining device. Omeluum tells you that although ceremorphosis has been put on hold the Netherese magic containing it can be instantly removed by whoever put it in place and then you instamorph into an Illithid. Only crazy people would be inclined to think the Absolute is going to give you any kind of autonomy back once you commit to her and the only reason I can think of to take her side now is if you believe your tadpole is there to stay and this is your life now. If we could ever communicate that ingame the Absolute would probably just detonate us remotely, though.
