Unicorns were added to Sims 3 in the Pets expansion pack which is available to buy though Origin, so what's so special about them? Well, Taming a Unicorn basically means you're going to win all of the Equestrian competitions, maybe you'll lose one or two but a Unicorn has maxed out skills so they're excellent at winning the competitions. Unicorns also have special abilities 1. Teleport - Unicorns can teleport without cheats which is cool and saves a lot of time. 2. Ignite - If you're playing as the Unicorn and click on the ground then you can select ignite which will start a fire on that spot. 3. Cure Fauna - Unicorns can use this ability on Sims or other household pets that have been cursed. It'll also take care of pesky fleas! 4. Extinguish - Unicorns have the ability to extinguish fires. 5. Bless Fauna - Unicorns can use bless fauna on other Sims or pets. This will give them a positive moodlet. This ability can also cure the mummys curse from World Adventures