After obtaining it, teleport back to the "Matriarch Ancestral Hall" above.
Go to where you defeated Huang Xingzi and use the Blood Dropper. A secret passage will appear behind us. At this point, the "Three Heroes of Kunlun" quest is complete.
Now we need to start the platforming section, jumping down along the red silk threads. Some threads have dust on them; it's fine to skip them if you don't want to collect them, as your capacity is already maxed out.
Reach the bottom, and after speaking with Void, she will give us a new Shadow Armament, "Void Flower Fan."
