Mood

Definition : the atmosphere that pervades a literary work with the intention of evoking a certain emotion or feeling from the audience; may be created by a combination of such elements as setting, voice, tone and theme

Examples: Abandonment, Hopelessness, Isolation

In the Book: The boys on the island have feelings of fear and abandonment. Piggy has feelings of isolation. There are many other moods, all of which are dark.