These couple of days I spent most of the time farming 1-7 and 1-8 in order to get the facilities leveled, lvling the weapons to lvl 10 allowed me to clear 1-9 at last, last tries of mirage garden with Ka'liaserin have reached 10th floor but the boss has x100 health bars, I tried today with kuro and the results were a bit better.
I tried 1-9 with 11992 power and was able to complete it, on 1-10 you can punch trough the stage but if you take the wrong turn you will lose time and wont be able to complete it, you need to go left left in order to fight the alaurne, like the treant she has 100 health bars but you can dodge most of her attacks and unlike the treant if you face her away of your group she doesnt hits them hard.
By the way here is a video of me clearing one step at a time abyss lvl 2 with 11440 power.