Quote Originally Posted by roosfamily View Post
I don't think you have to do the new adventure. When you have to do a specific adventure it's stated clearly, as for mithril. This time the goal says:

"Sacred horn and Sacred Wing are very rare. As our knights travel the land, we will have to hope they can find these items and bring them back".
Look in the Love Shack where you can craft the alicorn. You'll see it says that the wing and horn From Adventure.