Regarding 'that matter', Arthur was no longer simply curious.
With deeper understanding, Arthur could ascertain that 'that matter' was related to a monumental secret, and even the current state of the world was formed because of 'that matter'.
And he had an intuition that 'that matter' was extremely important to him as well.
So if possible, Arthur had to know about 'that matter'.
After all—
It revolved around his life!
He was someone who loved peace and was amiable.
His most desired life was one with both cats and dogs, farming and drinking tea.
However, some people would always disturb him.
Even unexpected troubles would find him.
To prevent such things, the only foundation was powerful strength.
Then?
Bury those who caused him trouble into the ground.
The earth always embraces everything.
Whether right or wrong.
Once buried, one can rest in peace.
As for choosing to be a 'Blood Descendant'?
The vest is meant for times like this, isn't it?
