Leannah
...Ok, she needed to revamp that working theory a bit.
Even so the ancient knowledge she was getting a chance to learn here was astoundingly interesting! Plus if the inscription was any more of a clue, then that thing she killed back there might have been one of many...at least if they were what remained of those 'heretics' mentioned in the thing. In which case, was the Guardian there to keep those things in and not people? Perhaps. Maybe the journey that was made from the place, an exodus of people/humanity leaving, were right to leave for some reason. Perhaps those that lingered there were cursed, or otherwise altered by the conditions there due to long-term exposure? Maybe there was a plague, or they tried to tap into untold or meddle with frankly dangerous powers as was common of humans in ancient myth.
Still it was more important to get this puzzle solved and maybe get out of there. But at least it seemed to God of Knowledge wasn't involved with the Tower and prison itself...actually seemed more like he was born after the whole event potentially. The way the inscription was worded, it seemed like "knowledge" had been born after humanity left the Tower where she still assumed they were created in by Delphiti (at least at this point in time).
So a potential timeline was:
-One, you get humanity made back in the Tower and what was now a prison, but over time there seemed to be a division among them. For now, she would have to assume that 'division' was wanting to stay in that place or leave it. Clearly those who left made the 'right' decision by far, whilst those who remained were 'heretics' and also very much 'cursed' for wanting to stay. So perhaps humanity was made there, then was meant to leave the place to go into the world and learn and populate it, but ala a "Garden of Eden"-esque situation some didn't want to leave when they needed to.
-Two, Delphiti the Moon Goddess wept due to the event (at least potentially), and it was her grief over the event that led to an 'overflowing of the cistern' and life springing up. Otherwise something had to make the moon goddess herself weep, leading to the Oceans springing up with 'all life' as Lazhira had mentioned prior.
-Three, humans settling in the world would lead to civilization. That much she felt she could try to read into it. Naturally with civilization and learning about the world came Knowledge. If this was when the God of Knowledge was 'born' or 'created' or however, that would potentially make sense in a mythological (if not magically literal one in this world) context. A deity born of something new arising in the world, in this case 'knowledge'. Again her new working theory, but it felt simpler this time at least.
-Four, what is a God of Knowledge but one who seeks new knowledge? It seemed a natural thing to do, and according to the inscription 'n turn gave birth to the desire for the secrets of the Oceans' and 'Desire turned into actuality'. So, if she was reading into this right, The Illuminator desired the secrets of the Oceans...the only 'secret' of which Leannah could assume was how to create life. Then the God of Knowledge managed to actually acquire the 'secrets of the Oceans', potentially being (in the current theory) the secrets to creating life. In fact, as an addendum to this theory there was one other thing that could be tied to this. If other deities had created other races (like a certain sun goddess making the Bastelian race perhaps) then this knowledge has spread and been used to create more life....again which would make sense within a mythological context potentially at the very least.
-Five, 'thus a seal was made by their accord' seemed to make sense with the 'sealed path' bit Lazhira mentioned earlier. The God of Knowledge, desiring the knowledge of how to make life, made a deal with Delphiti to gain that knowledge in return for helping seal away the complex she and the other Earthers had woken up in and had their bodies eventually 'created' in. Seal away that accursed place and its denizens, and keep others from entering and potentially making the same mistakes or accessing forbidden knowledge or secrets or so forth inside. Or perhaps Delphiti simply didn't want anything to do with that place anymore, so she gave the info simply to have her 'problem' locked away by making a deal with The Illuminator. Still, the "Oceans" made her suspicious of that goddess who had brought them all here, whom she suspected was somehow tied to the oceans naturally but somehow the moon as well? Hmm. Perhaps Delphiti's actions birthed another deity from the Oceans themselves? Was the white child dumped overboard into the seas 'that' goddess, The Illuminator, someone else, or even Lazhira of all people for all she knew?
Regardless, she had her new working theory for now. Likewise with this came a new plan of action for her to take! Hopefully it got the puzzle right this time.
With this in mind, Leannah would reach into the one knowing-looking statue's vase to grab the crystal sphere. She would also study the knowing statue's face and such, seeing if there were any 'recognizable features' akin to the goddess that had brought them all here. If the necklaces weren't doing it, though then this likely would for that bust's reaching hand! The catgirl would then go place the crystal sphere into the hand of the two-faced bust statue. If this represented the 'secrets of the Oceans', then this would be what the Illuminator had wanted! (hopefully) and correctly recreate the myth! That seemed to be the main goal here anyways.
Then what of the necklaces, though? Well, they had to represent something. So once she was done placing the crystal sphere, she went to place the necklace from the tower onto The Hooded Figure (maybe Delphiti?) statue and try to see if it would click it into the space where the other necklace had been before. The teardrop-shaped gem meant that it fit with 'tears', and a star-shape carved into it fit with the star-mark situated within the crescent moon. If that did nothing, she'd then place the necklace into the statue's outstretched hands (or hang it on them otherwise of that didn't work). If all those prior things didn't work, she would see if the gem popped out, albeit not to where she'd break the necklace if it didn't easily come out, and see if she could slot the gem into the carving on the wall The Hooded Figure looked upon.
Hmm. In hindsight of her last theory and this new one, did Delphiti have a child? Wait. White eyes, stars being white in the sky, maybe she had a child who was of the stars? Were they sacrificed to seal the path to the prison or something, and were they actually in fact the goddess who'd brought them all here? Was she some 'guardian' placed to watch over the place as well? After all, there'd been a pillar after leaving the 'prison' and this statue woman was sitting on the pillar itself. Eh, she was theorizing again. Ugh. She had to continue to focus on this first, then she could maybe toss in some more for her theory unless she needed to fight or something.
Still, once she was done there she would turn about and go over to the statue with the vase she'd taken the crystal sphere from. Here she would try to put the heavy stone necklace onto the vase-holding statue's neck. If that did nothing, she go with her gut feeling and put the heavy stone necklace into the vase. If that did nothing, she would resort to trying to put it into the cistern. Something about 'overflowing a cistern' and that action tied to Delphiti, and that picture book had Delphiti dropping some white-eyed child into the ocean, so maybe a heavy necklace might block up the cistern or cause the water to 'overflow' in such a case. If that did nothing she'd grab it back up and hold the stone necklace once more and put it on herself.
Come to think about it on the side, however, the crystal sphere reminded her of the one back on that statue, sitting where maybe some incandescent eldritch deity's head might sit-...hmmm. That was actually something to think on after all of this actually. Maybe not right but it was a fun thought to toss around within the bounds of her theory.
Hopefully, though, her revised but still working theory was better. More so she hoped her actions would generate the right 'combination' to get her out of here.