The unicorn offers tranquility and is unseasonably warm. If you have a unicorn, go to any city with a stable and stable the unicorn. Lock the unicorn inside while you are outside, then draw your weapon to make the unicorn mad. A guard will go inside the stable and start attacking the unicorn. Close the gate in after the guard while remaining outside. The unicorn will kill the guard and you can loot the body. Each guard has a key to his respective city. You can then fast travel to another city and repeat. Some of the stables have a way for the unicorn to get out, so beware. If the unicorn gets one attack in, it will probably kill you. The only way to kill unicorns is with daedric, magic, or silver weapons.