Possible Clues:

• Heaven it's not
• "'__ is empty / And all the devils are here'": "The Tempest"
• Horrible situation
• Foo Fighters song for devils?
• Word sometimes spelled with 'double hockey sticks'
• "Paradise Lost" setting
• Dante's 'Inferno'
• 'A half-filled auditorium,' to Frost
• Epitome of hotness
• Awful place that man is going to