Making most of this topic to explore other questions I asked myself during my second run:

- The living memory: is it really the famous 12th floor of the Everkeep as told in the msq ?
Explaining myself: we were told Solution 9 is the 9th floor and the biggest floor of the Everkeep... however, it seems the area we visit is small compared to the vastness of the whole floor. Besides there is only one big aetheryte. When we go to origenics to get to the 11th floor, where we fight Zoraal Ja, there is literally nothing more above our heads, save for the huge black purplish gate Sphene took there is leading to the living memory. However, if we stick to the numerical model of the Everkeep Cahciua and Shale show us in the Backroom, there should be something physical leading throughout the gate, like behind Zoraal Ja's throne or something like this. Furthermore, the sky is plain blue up there though we should be in a dark sky as we are at the bottom of the Everkeep, it's like we can't even see the lighning dome whereas we should see it clearly... when we ere on the ground at the feet of the Everkeep, looking from afar like from Yyasulani's train station, we clearly guess there is some thing physical going through the clouds, above the 9th floor and above the 11th floor we can distinguish.... I know I may quibbling over what seems minor details, but I think something missed there from the point of view of immersion...

- Size of the living memory: even if Solution 9 is a small part we visit. We know its high as shown by its size and from the exterior, and only from what we are shown and unless I'm wrong here, living memory is supposed to be smaller than Solution 9, however... living memory has 3 aetherytes and an infinite-like horizon area with large skyscrapers and all... I can't fathom it being on top of the Everkeep when we're told Solution 9 is the biggest floor... any idea ?

- Vegetation in the living memory: How can vegetation and water can persist in the living memory when we're deleting every Endless we meet (save for in-game quests to aether winds for example), every area in the living memory just become plain inert electrope. Like dead areas where nothing should live, or remain living after centuries...

- Another thing: the gate above the 11th floor. It leads to another shard, the one from where the living memory is. However, we know the Heritage Found is also from that same shard, right ? Though it has fused with our world with the Key to link the worlds. Therefore: does the Vanguard, in the end, act as a gate like this void-gates like and the one above the 11th floor or the one in the depths of the Skydeep Cenote, or does it only act as a mean to cross the lightning dome as we were told too ? Like without the Vanguard they couldn't cross the dome as some of you said too because they were grilled when trying to do so.