In that sentence severely would mean to the extreme like without the word severely added in there the sentence would change
        
             
        
        
        
The tone that can be found in "The Perks of Being a Wallflower" is a nostalgic, inquisitive and exploratory tone.
<h3>What is tone?</h3>
It should be noted that tone in literature simply means the mood that's created based on the words are implied in the literary work. 
In this case, the tone that can be found in "The Perks of Being a Wallflower" is a nostalgic, inquisitive and exploratory tone.
Learn more about tones on:
brainly.com/question/15447799