The Unicorn Fish is a quest item that is needed for the Angler. This fish is obtained by fishing in a Hallowed Lake. But before you catch it, it will attack you, so beware! It is also rarely obtained by killing Unicorns while in water.
Unicorns and rainbows are absolutely great! They're everywhere, even in water. No, really, I actually saw a unicorn fish in a Hallowed lake! Your job is to reel it up and let me have it as a pet!
- Added to the game.