"If the plan is successfully completed, Mary, this heart that belonged to Tuobert will be your reward. As for the rest of you, continue to distinguish yourselves, and perhaps the heart of Fomuir will belong to one of you."
Just wielding a big stick can indeed make the blood servants revere you, but it doesn't necessarily make them give their all.
However, with the carrot added, I believe these vampires will exert all their strength for the tasty heart of a pureblood vampire.
But by looking at the expressions and eyes of Bloody Mary and the four blood servants, one can tell that the tactic has worked.
Send away the blood servants.
Liszt sat on the mount that originally belonged to Deborah, concentrating as he summoned the Smoke Mission.
As early as when he was bathing, he had already received the task completion prompt: "Complete the task, reward an unknown number of Little Minor Elves."