Shingi didn't like his latest discovery, but he could do nothing about it. Requirements for evolving a class only changed up to level 60, and since he had reached that point, there was no way to go around it.
He knew some classes needed the user to consume a particular substance, but those requirements were scarce. But he had a True Class, so it made sense that it needed something of that rarity.
As for the source, Dragon Blood was something he couldn't find outside, no matter how much he offered. After a dragon's death, its blood would become unusable in a matter of minutes, and keeping it in a fresh state, would require the use of some rare resources, and the time it would keep it fresh would be up to a couple of days. There was no way someone would sell it even if one had any at its disposal, as they most likely had a reason to gain it themselves in the first place.
