According to National Geographic (http://animals.nationalgeographic.com/animals/mammals/narwhal.html), this "unicorn of the sea" doesn't have a horn at all. It's "unicorn horn" is actually an enormous tooth that grows right through the male narwhal's upper lip and up to a length of almost 9 feet!
In Nature Dome, that amazing tusk not only gives the narwhal a respectable Attack Value on its Power Card, but also makes the narwhal Attack Boost card the most powerful one in the deck.
Put the one-two power of the narwhal to work for you with your own deck of Nature Dome Mammals--available with free shipping at www.NatureDomeGame.com.