Possible Clues:

• Horrid Tolkien creatures
• 'The Two Towers' army
• "The Lord of the Rings" baddies
• Foes of hobbits
• 'The Lord of the Rings' creatures
• Tolkien's corrupted elves
• World of Warcraft creatures
• Uruk-hai and others, in "The Lord of the Rings"
• Tolkien's Gorbag and Bolg
• Ugly Middle-earth creatures