What does the phantom do to Carlotta in phantom of the opera?

In "The Phantom of the Opera," the Phantom, a disfigured musical genius living beneath the Paris Opera House, becomes obsessed with Christine Daaé, a young soprano. He manipulates and terrorizes the opera company to eliminate Carlotta, Christine's rival, orchestrating events to undermine her performances. Ultimately, he causes Carlotta to fail on stage, ensuring that Christine takes the spotlight instead, showcasing the Phantom's desire for control and his obsession with Christine.