One key element could be their creation process. How were they made? Was it through a long series of experiments? Another element might be their initial purpose. Were they meant to be a tool for discovery or for defense? Also, the people or forces involved in their creation are important.
The key elements in the visions back story include the origin of the technology or power behind them. If it was a new kind of energy source, that would be a major part. Their relationship with the users or those who first discovered them is also crucial. For example, did the users immediately understand their potential or did they have to learn over time? And the events that led to their widespread use or recognition are also key elements.
In the visions back story, the purpose for which they were created is a very important element. If they were created to enhance human perception in a world full of hidden dangers, that would shape their entire story. The environment in which they were developed is also key. Was it a high - tech laboratory or a more natural, spiritual place? And the individuals or groups who had a hand in their development, from the inventors to the early adopters, are all essential elements in their back story.