Quest for the Unicorn's Horn

From the back of the book: The King lies poisoned. At the border a dark horde awaits only his death. Ahead are only cruel traps, awesome monsters...and the horn of a unicorn. Only its magical healing power can save the King. The bards will sing your glory in every hall if you succeed. You will die forgotten if you fail. The eternal hero, alone, you stride forward to meet your challenge... Quest for the UNICORN'S HORN