Disappointed that the Quartz of Power didn't work, Sulos asked you to find out how to catch a Glowing Spirit alive. So you went to ask Lumen, a Reian High Sorcerer. He said he could make a Magic Cage to capture the spirits. You went to Macori Hill and collected Macori's Lanterns needed to make it. He was excited at the prospect of seeing a Glowing Spirit.