Question: Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: What does Asa's plan to drain Katia off? Title: La maschera del demonio/Black Sunday Movie plot: In Moldavia, in the year 1630, beautiful witch Asa Vajda (Barbara Steele) and her paramour Javuto (Arturo Dominici) are sentenced to death for sorcery by Asa's brother. Before being burned at the stake, Asa vows revenge and puts a curse on her brother's descendants. A metal mask with sharp spikes on the inside is placed over the witch's face and hammered into her flesh. Two centuries later, Dr. Thomas Kruvajan (Andrea Checchi) and his assistant Dr. Andre Gorobec (John Richardson), are traveling through Moldavia en route to a medical conference when one of the wheels of their carriage is broken, requiring immediate repair. While waiting for their coachman to fix it, the two wander into a nearby ancient crypt and discover Asa's tomb. Observing her death mask through a glass panel, Kruvajan breaks the panel (and the cross above it) by accident while striking a bat. He then removes Asa's death mask revealing a partially preserved corpse that is visible underneath, her face staring out malevolently. He cuts his hand on the broken glass. Some of his blood drips onto Asa's dead face. Returning outside, Kruvajan and Gorobec meet Katia (also played by Steele). She tells them that she lives with her father, Prince Vajda (Garrani), and brother Constantine (Enrico Oliveiri) in a nearby castle that the villagers all believe is haunted. Gorobec is instantly smitten by the beautiful young woman. The two men then leave her and drive to an inn. The witch Asa is brought back to life by Kruvajan's blood. She contacts Javuto telepathically and orders him to rise from his grave. He does so and goes to Prince Vajda's castle, where Vajda holds up a crucifix to ward the reanimated corpse away. However, Vajda is so terrified by the visit that he becomes paralyzed with fear. Katia and Constantin send a servant to fetch Dr. Kruvajan, but the servant is killed before he can reach the inn. It is the evil Javuto who arrives to bring Kruvajan to the castle. Javuto leads Kruvajan to Asa's crypt, and Kruvajan watches in horror as her coffin...
Answer:
Her blood