Fine...

That only puzzled the twins. "How come you need us for such a thing?"

"That's because of the barrier passage requirements," Spiegel continued. "The Ruins of the Stars is now open, but there is an ancient formation inside at the Divine Level. Our Formations Masters tried to break it, but they were unsuccessful. Yet, they found what is needed to enter the Ruins. The barrier works with Light and Dark Elements working in unison. If you are able to inject these two elements in a balanced manner, it should be possible to harmonize with the barrier and pass through it."