LAMV wrote:1a. Just to clarify what was said in the first page, if I go past Level 5 in any Reyvateil's Cosmosphere, I'm locked into her ending, correct? So I can choose, say, Cloche's path and as long as I don't pass her Level 5 Cosmosphere and I save at the last save point, I can use that save to get any of the other girl's endings (besides Luca's)? If so, that's a good idea.
Yes, that is how it works.
LAMV wrote:2. If I pass Level 5 of someone's Cosmosphere, I can't go pass Level 5 for anyone else, right?
Correct. Furthermore, once you have chosen a girl as your definitive partner, you will be kicked out from the Cosmospheres of the others at Lv. 5, just before the point that activates the Paradigm Shift.
LAMV wrote:3. What happens if you pass Cloche's or Luca's Cosmosphere Level 5 BEFORE the big decision? Like, you go over Level 5 with Cloche but then decide to choose Luca's route? Or are you not allowed to enter Level 6 and over until you enter a certain Phase, like in Ar Tonelico 1?
In this case, the Talk Topics and plot advancement were made in such a way that you won't be able to go even to the Lv. 3 of either Cosmosphere before the decision point, so it's impossible.
LAMV wrote:4. Are the other girls' endings different depending on if I'm on Cloche's and Luca's path? Like how in Ar Tonelico 1, the ending with the 3rd Reyvateil is slightly different depending on if you went with Aurica or with Misha? Or are the other girls' endings the same regardless of which path you're on?
No, the endings for the 3rd Reyvateil and 4rth ending are the same regardless of which path you chose.