After picking up this flower, don't go to the cave on the right yet. Instead, climb the ladder to the left of the treasure chest. Once you're up, head left.
Slide down the stairs.
After coming down, pick up the Dust next to the corpse on the left.
Turn around to grab the item ahead, then go down the stairs on the left.
While going down the stairs, there's also some Dust on the wooden plank to the right that you can grab along the way.
Come down and defeat the enemies here. Pick up the Dust in the corner, then you can head back up.
Let's head back the way we came and go into the cave.
Inside the cave, you can see two books and an item on the right. Interacting with the modification bench also yields Dust.
The books are [Various Votive Texts #2 Zhou Chuan Votive Text].
Book: [Various Votive Texts #5 Unfilial Descendants' Three Relocations Votive Text].
