Spirit Association Temple
The Divine Seal Art had to be one of the most mystical and mysterious cultivation arts across the God Galaxy. Everything about this art revolved around the soul. The requirements to even began cultivating the art stemmed from the soul.
If not for the soul ritual Cain and Amber used during their Divine Ascension, they would've been just as lost as anyone else when attempting to cultivate this art.
When bluntly speaking about it, Cain and Amber would admit that the Divine Seal Art didn't have any overwhelming combat advantages. The effects it could offer were passive at best.
If Cain and Amber utilize attacks purely with soul energy or heavily based on soul energy, they can revolve their art to slightly seal the energy of their foe's attack. Sealing an attack would either completely negate it or heavily weaken it.