Divine Physique 1
There are 4 million high-grade crystals here, about 50 different kinds of Saint-grade medicines, more than 50 high-level grade-4 artifacts, 7 Golden-grade techniques, 2 bottles of Spring of Life... Some maps of the Spiritual World, especially the Continent of Beasts...'
Minos said in his mental communication with his wives, presenting them with the numbers of the riches he had just acquired.
There were many things there that were not useful to dragons. But things that were valuable to humans and other races had their value to every being in this world. As long as you could barter, any kind of currency was valuable!
There were also many documents and books there, things that Minos would eventually have his men of the Black Plain Army study and catalog.
Depending on what they contained, they could help him with his plans for the Central Continent and the rest of the Spiritual World!