[17%] : (Nitpick)
"Are you crazy?! You could have gotten us killed!" Dilarr shouted.
"But I didn't, did I?" I countered.
The fan translation rendered the latter sentence as “Ah, relax. We all made it through alive, after all. ♡" - yes, complete with a heart symbol. XD It's basically that fake cutesy tone Lina sometimes uses to avoid taking responsibility for something (and it never works).
[26%]: "If this place was connected to the council basement, surely there would have been rumors about it at least, right?" I'm not sure simply going with "this place" conveys Lina's point very well, that being how having access to a whole cave system from below the council building would surely pique people's interest.
[78%]: "Her spell appeared behind us, rushing our way, and..." Are you sure the spell somehow bounced back at the barrier? (Aria was inside the barrier when she cast it.) If she used the same tactic as Lina did the day before, she should have simply summoned a stationary Fireball outside the barrier and then made it explode. (So only the shockwave would hit the Lei Wing, which does not have a really strong shielding effect to begin with.)