The Elements of Harmony. Arguably the most powerful magical artifacts in existence, but relatively simple in terms of their execution. Find the evil, shoot it with rainbows, and you're done. Problem solved. Yet nopony knows why they work, or what they actually do to the evil they're pointed at. It's a question many scholars have tried and failed to discover. However, their most egregious error may have been treating the elements like things, mere objects. Maybe those who studied them may have made much more progress had they considered that the Elements were very much alive.