Hello, Daoguang dust can be disassembled by the "Dismantle" function in the backpack bar, and a certain amount of Daoguang dust can be obtained by disassembling the equipment.
Daoguang Dust can be exchanged for gift boxes at NPC Daoguang Fairy in Yucheng, Lin Chun, and can also be used by fortune tellers to draw lots (there should be other functions, I forgot ...).