What Really Happened

As Libraia was also there, Kentucky kept things simple and didn't mention his Regal Bloodline. "There was indeed an inheritance left behind by the Minokawa called Ume. However, for me to receive this inheritance, I had to do something quite complicated that reduced my overall strength to less than a tenth of what I usually can unleash." Obviously, he excluded the blood found on his father's feather. 

Libraia immediately remembered the Kawa Blade Domain. "That was indeed a very impressive attack. Inside that domain, you're sure to have a strength higher than before. Not to mention that this inheritance allowed you to learn how to control the power of space, albeit slightly. Wasn't there anything else of use?"