Relationship manipulation is the power to manipulate a bond between a couple. Chelsea is the only known vampire with this ability.
Description
She can make people turn away from others, and also strengthen the bond of one person to another. Her main purpose in the guard is to separate the guilty from the innocent by breaking their relational ties. When Aro is interested in a certain vampire, she strengthens the ties of that vampire to the Volturi, to influence them to serve willingly.
Limitations
She cannot as easily influence the emotional ties of people when those ties are stronger than just friends or acquaintances. For example, she could not have changed the way Edward and Bella felt about each other.
Her power is also mental, as proven when she tries to bind Bella, Edward, Benjamin, Zafrina, and Kate to the Volturi during the conflict in Breaking Dawn, but was unsuccessful due to Bella's shield that blocks mental powers. Eleazar also suggested that abstaining from human blood allows vampires to form deeper bonds that Chelsea can't break, though this was never proven. It is not known if Chelsea could influence people while she was human, but, according to Carlisle's theory that every vampire brought their most powerful trait over when they changed, she may have been able to or at least knew her way around them.
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