Once you deliver the Black Soul Gem to Harkon, he will perform the ritual, stripping you of your humanity and solidifying your new bond with his daughter, Serana, who will then be available as a follower. Prerequisites and Initial Encounter Before you can even speak to Serana, you must first trigger the main questline of the Dawnguard expansion.
Starting the Serana Follower Quest at Castle Volkihar
" This specific dialogue selection is the crucial trigger that allows him to initiate the transformation ritual. If you are a vampire yourself, she will heal you periodically in combat.
You must travel to the isolated island of Solstheim, far northeast of Skyrim, where she is trapped in a secluded cave surrounded by draugr. If you fail to make this choice and simply attack Harkon immediately, the opportunity to gain Serana as a follower in this manner is lost, locking you out of this particular recruitment method for the remainder of the playthrough.
Starting the Serana Follower Quest at Castle Volkihar
She is a powerful ally, utilizing a bow or destruction magic to overwhelm enemies from a distance. Completing the Transformation Ritual After you have convinced Harkon to spare your humanity, he will task you with a final errand: retrieving the filled Black Soul Gem from the Forgotten Vale.
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