"Alright."

She shifts her grip and bites the priest, driving her will but not her essence into his soul.

That works. 

He goes limp, then - "By the divines! It's as if my eyes have been opened! I - I must obey you. What would you have of me, master?"

She lets him go. "We have a scroll for you to read. You will return with us to Castle Volkihar."

"Yes, master."

Seems to be working. Good. Anything left to clean up here?

Some looting left to do, but that's all the enemies.

Then they can be moving on soon.

Yup. Ena finishes checking the corpses for valuables, looks around for any chests or something, and then says, "Shall we go?"

"There's not much to be gained by staying here."

"Alright."

And away they can go.

"What do you know about vampire thralls?"

"They have to do what you say? Mostly what I just saw."

"Any goals, any desires or intentions the thrall may have had are overwritten with the compulsion to serve their master."

"Works on anyone?"

"Not werewolves, not other vampires. Attempting to turn someone else's thrall can fail, for lesser vampires. And over time, the thrall's mental ability degrades until they are incapable of even moving without an order."

"So there's no fighting it?"

"Not in my experience."

"...Does it work on non-humanoid intelligents, like dragons?"

"...I have never heard of that being tried."

"It'd be an interesting experiment, a dragon thrall could be... something. Though you'd have to get one to hold still."

"And get through its hide."

"Maybe you could open a hole with a sword. Or go for the wings, those're fairly thin."

"A major blood vessel is preferred."

"Yeah. I think there's one in the fleshy part of the wing, but not really in the wing flap itself. Ah well."