Tone

Tone
Tone is basically the feel of the writing. You can really tell the tone of a writing, mostly because of how it makes you feel. If it is a piece of writing that is dark, It's tone will tell you this. Tone is affected by vocabulary, dialogue, and a number of other things.

Example
William really wanted to make a dark and brooding sort of tone to the book Lord of the Flies. He outlined the struggle to find humanity, and the thin blurred line between civilization and savagery. He uses a dark setting and death to make a tone of lost humanity. All the other litterary devices combine into tone.