Listen for a deafening peal of thunder. The unicorn roared in a voice of thunder. -- Kathy "Nightstar" Garrison, "Unicorn Lost" (2004) At its loudest, a unicorn's roar resembles: a thunderclap through Alpine crags a roaring locomotive a waterfall the crashing of immense ocean waves cannon fire an avalanche of boulders a hundred kettledrums an earthquake a cracking glacier an erupting volcano Such a howl is as thrilling as it is frightful. Depending upon the unicorn, the blast may sound: ominous oracular