Temperature Difference Colloidal Material!
To Richard, the large-scale extraction method of Temperature Difference Colloidal Material was considered the most precious knowledge among the treasures of Black Spirit King's Island—without equal.
This knowledge, compared to extracting components from the Sewing Monster or improving Divine Blood, wouldn't directly increase combat abilities, but it was more important.
Once Richard had mastered this knowledge, he could produce a large amount of Temperature Difference Colloidal Material and then process it to create numerous temperature difference generators. By solving one minor issue, he could truly usher Eden into the age of electricity.
The minor issue that needed solving was ensuring the temperature difference generators functioned and generated electricity continuously, namely—they required a qualified heat source to start up.
How could this qualified heat source be obtained?
