Floor 3 Chamber 2.
https://youtu.be/ucP5r0q97xo

after this, i started over from chamber 1 with amber instead of noelle.
just managed to win chamber 3 and got xiangling.

finally got her. after 2 months.
with c0 f2p characters under lvl 20, r1 3-star weapons, and r1 4-star artifacts.