In The Subtle Knife who is the antagonist?

In "The Subtle Knife," the antagonist is primarily represented by the character of Mrs. Coulter, who embodies the oppressive forces of the Magisterium. Additionally, the Specters, malevolent entities that consume the souls of adults, serve as a significant threat to the protagonists. Together, they create obstacles for Lyra Belacqua and Will Parry as they navigate their intertwined destinies.