In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: In Paris 1877 a pack of rats save an abandoned baby from a basket that was flowing along a river. They raise him in the underground of the Opéra de Paris. This child becomes the Phantom of the Opera, a misanthrope who kills anyone who ventures into his underground chambers, just as rats are killed whenever they venture above ground. The Phantom falls in love with the young opera singer Christine Daaé, while she sings alone on stage one night. He appears before her and tells her that her voice fills his heart with light. After leaving, he speaks to her using telepathy and the two begin a romantic relationship.
The aristocratic Baron Raoul De Chagny has also fallen in love with Christine, though at first Christine offers him only a platonic relationship. Later, she ruminates that she may be in love with both men. One night, the Phantom calls to her and she descends to his lair across an underground lake in a boat. Upon arriving, she finds him playing an organ and he tells her to sing for him. Christine sings the same song he heard her sing when he first saw her onstage. After making love in his bed, the Phantom reveals his past to her. He tells her to stay in the lair while he goes to secure the role of Juliet for her but she refuses to stay alone, causing him to storm out. Christine grows angry with him and as he leaves in the boat she shouts that she hates him.
What is the short nickname of the person who speaks to someone using telepathy?