The unicorn is a species of horse that has a horn in the middle of their forehead. They are very rare. There is a rumor that they are intelligent, but, so far, this has not been proven. There is also another rumor that some larger and more powerful force protects and keeps the unicorn out of the hands of civilization.
If a unicorn is ever caught, all efforts to train them will be unsuccessful. Any opportunity given to the unicorn will be taken advantage of and the unicorn will escape. Mind controlling magic does not work on a unicorn.
Reality
1175-1225
A mythological horse with one horn in the middle of its forehead. It is a symbol of chastity and virtue. It is also mentioned in the Bible. It is believed now that the unicorn was actually either the wild ox or the rhinoceros.
Deuteronomy 33:17
His glory is like the firstling of his bullock, and his horns are like the horns of unicorns: with them he shall push the people together to the ends of the earth: and they are the ten thousands of Ephraim, and they are the thousands of Manasseh.