Nix The Nickel Horn Unicorn’s Story. Nix the Nickel-Horned Unicorn can detect when another unicorn is in danger and he can arrive in the nick of time to nix any disaster. He is a steel gray unicorn with a horn that looks like a lightening bolt. Nix is called Brave Nix Nickel Horn – Defender of the Unicorns. When he senses another unicorn from the tribe of metal horns is in danger his metal horn acts like a compass to magically take him to the location of the danger. His horn has the blasting power of 10 sticks of dynamite. He can also use his horn to induce rashes, itching and blisters on creatures trying to cause harm to others. Read more.