Black Breath
From Tolkien Gateway
The Nazgûl were surrounded by an aura of terror, which affected all living creatures; their breath (called the Black Breath) was poisonous, and their cries caused terror and despair in all who heard them. The three primary victims mentioned in The Lord of the Rings were Faramir, Meriadoc Brandybuck, and Éowyn. It was dispelled from them by Elessar Telcontar at his return with Athelas, proving him to be the heir of the throne of Gondor.
No mention was made of the Black Breath in Peter Jackson's film version.
