Demonologist

1. The study of demons.
2. Belief in demons.
3. A list or catalog of one's enemies: "As the years passed the magazine's demonology expanded to include Bolsheviks, radicals, Franklin D. Roosevelt, the New Deal, Government work programs or aid programs of any kind"

Sam: "so what do we do?"
Colby: "I think it's best if I contact a Demonologist"
Sam: "oh yes, they know better"
Colby: "exactly"