Yuan Ming nodded silently as he read this segment; he gained a deeper understanding of top-grade magical tools. After steadying his mind, he continued reading.
The book also mentioned two methods for forcibly upgrading ordinary magical tools to top-grade magical tools.
One method was the Refining Method, which involved mixing top-grade spiritual materials into an already refined magical tool through special means, allowing it to withstand the Enriching of a fourth rune.
The other was the Strong Injection Method, which, simply put, was to choose the fourth rune as a derivative of the runes already on the magical tool. For example, if the magical tool had a "Frost" rune, then the fourth rune could be the derivative "White Frost" rune or the lower level "Cold" rune.