The reason has been stated earlier—the Original Blood Crystal from the Blood Wing Clan was nearly exhausted during those previous experiments. Not only that, but even the blood, preserved in two copies and interred after death, was consumed significantly. With only commemorative significance, once discovered to be beneficial for experimentation, these items were depleted quickly. In just a few months, the Blood Wing Clan currently has only cremated remains... uh, only blood suitable for mourning from Lionel and Michael's predecessors.
"Therefore, both Raphael and Lionel, the clan leaders, are very anxious. After all, the Blood Wing Clan has invested too many resources for that drop of blood. It's certain they wouldn't easily let go until the last moment, especially when there had already been considerable progress."
