1) Sorcery 
• (n.) Belief in the existence of vampires. • (n.) The actions of a vampire; the practice of bloodsucking. • (n.) Fig.: The practice of extortion.
The draining of psychic energy from one individual by another. 
Vam'pir·ism noun [ Confer French vampirisme .] 1. Belief in the existence of vampires. 2. The actions of a vampire; the practice of bloodsucking. 3. Fig.: The practice of extortion. Carlyle. 
noun the actions or practices of a vampire