Star Wars: The Rise of Skywalker introduced the concept of the Force Dyad – an idea Lucasfilm has been exploring in Star Wars tie-ins and handbooks ever since. Every Star Wars film adds something new to the lore, and Star Wars: The Rise of Skywalker was no different. One of its most intriguing ideas is that of the Force Dyad, the name given for the mysterious bond between Rey and Kylo Ren that proved to be a wellspring of power greater than life itself.
https://screenrant.com/star-wars-force-dyad-origin-history-canon-explained/