Before leaving the Ancient Ruins, like the old gentleman suggested, I had us fully explore it this time.
Back then, we stopped halfway due to how dangerous it was for Mortal Ranks to continue and it was also along with the advice from the old gentleman.
Further in, we encountered traps and creatures like the Ogres or Ruin dwellers awaiting us. They're stronger than an average Rank 5 Mortal. And that became something like training for the twins and the couple.
They volunteered to do it while the three of us scanned the place to look for valuables and to discover more things hidden in this chopped-off piece of a Sage World.
I tried adapting to the Source Energy of this World and I succeeded albeit, it's at the same state as the Psyche Energy from before. It's incomplete so there's not much application to it. It enhanced my Spirit Pathway and adapted Spirit-type Source Energies.
And likewise, Jayna, Yumiko and the other four also experienced it.