A Deep Dungeon Possible Issue

[Kurogaea]

Some of you may know your able to make your aether gear solidified so you can use it outside the dungeon, and to do that you need to get them to lvl 30. Now, I'm at 28 Arm, and 29 Armor. Which means the last floor is the only place I'l get my level up I need. Now say if rng was being a "Diadem" and you didn't level your gear once, in that place during that floor. If you continue onwards, well your gonna have to run it all over again to 1-10, BUT...if you leave the dungeon dooming your team members you can have another shot at getting the levels you wanted.

Just so you know I never seen this happen, but the thought sparked in my head because this rng bs will make players wanna go "F*** this place!" That is all.

Also a quick non topic related question. Anyone know if the Return Cairnes (w/e) actually allow you to keep your gear levels? And also how the heck do they work? XD (answered, thnx )