Helping Yuki, Kirito notices a reoccurring pattern among the sliding tiles and starts to expand on that.
It's not long after, and Yuki figures out that the pattern should be that of an Old Realm Kanji – or symbol – perhaps something with meaning to the gods?
Trying a number of patters, Kirito finally hits on something with the symbol of Mount Fuji.
There is a loud click and the wall suddenly slides open, bathing the interior of the shrine with a blinding white light.
Rather than opening out the back of the shrine (as could be expected), the open wall reveals an extra-dimensional space beyond the outer wall – A grand circular chamber walled in gold with a lustrous marble floor and matching domed ceiling. Columns of polished green soapstone, accented with inlaid starmetal and orichalcum script, lined the perimeter, while a narrow well rested in the center.
It was what occupied the space ten feet directly above the well that caused everyone’s heart to skip a beat as they looked in – Sakura Kashiwagi and Keitaro Hokusai – their naked bodies held unconscious, yet alive, in some kind of stasis.
Once Kirito and Yuki had recovered from the initial shock of seeing their former friends’ bodies hanging there in the strange room, they took a moment to feel out the flows of magic emanating from within.
First, with her Sorcerer’s Sight, Yuki could see that the lines of spiritual attunement originated from the exact center of the chamber, where all of the power of the manse was being focused into holding some great and unknown power within – the same place where Sakura and Keitaro hung suspended over the well.
Yuki also noted a total of six lines of attunement radiating from the manse – one to herself, one to Udo, one to Roka, one to Sakura, one to Keitaro, and one pointing south, but only for a few feet before it tapered out of sight – Uncle Yunikawa’s, Yuki surmised.
Kirito meanwhile (while he could not see the lines of spiritual attunement,) could sense some kind of epic spell in effect – a spell of protection or a powerful ward of some kind that Kirito suspected was in place to allow the room itself to exist – that and to give some kind of empowerment to the strange script which lined the columns…