I am looking at the PDF and all it says
"Proceed to the Beacon of Elements and solve the Challenge (use the exotic Ores you loaded, Galaxite can be obtained at the Elemental Fields, Solution: Boron, Promethium, Infernium, Morganium, Halidium, Chtonium, Galaxite). It is recommended you load up on some Chtonium in the Fields as well, you need at least 3 later"
It does not say how I use the ores.