So, Vairocana, the embodiment of the concept of the Five Tathagatas, comprised of the concepts of all seasons, elements (wind, fire, earth, water, space/void), the cardinal directions, and the conventional five archtypical modes of wisdom in Vajrayana/Mahayana Buddhism. I am not a scholar of Buddhist doctrine by any stretch of the imagination, but I know enough to realize that these combined concepts make her overpowered as fuck.
Whenever any character in anime/manga is typified by a symbol of Buddhist doctrine, they're always overpowered as hell. That's just the way it works, apparently.