"This is a resource I made using the Mystic Arts combined with Dragon Blood, which I call Dragon Blood Crystal, or Dragon Crystal for short. It's a small token of gratitude, and I hope you won't find it too humble," David Jones explained.
It is not uncommon to use the Mystic Arts combined with rare treasures to create unique pet training resources.
Not to mention the pet training families within the Flowery Kingdom, even some senior researchers have developed quite a few unique pet training resources.
David chose to give away a Primary Dragon Crystal partly because he wanted to thank Grau the Mysterious Dragon for his righteous help and, incidentally, test if strengthening the Primary Dragon Crystal's favor would be useful for Grau the Mysterious Dragon.
Another reason is that Primary Dragon Crystals are on a completely different level compared to High-level Dragon Crystals in terms of Pet Resources.