I want to preface this by saying, I am not trying to hate. My intention is to give thoughtful, honest feedback so that every story I rate has something the author can walk away from and both appreciate and work on. If I sound rude that is entirely accidental, I'm only intending to give helpful, honest criticisms and praises.
I really liked the imagery of the vampire before and after sucking the blood from Darguth. The way you described her was perfectly creepy. The transition for Darguth was also done really well. I'd say my only criticism would be some pacing hiccups in some places, specifically right as Darguth joins the fight. Overall though it was a good story and an enjoyable read!