...ask about the meaning of Quturan.

Summary For your highness, who was erased from the annals of history,
you may inflict but a small influence upon this world.
Insignificant, but still, a beginning to let your presence be known.
Your father, King Dahad Seric, left this last will.
You may not fully comprehend its words.
I believe it best that you meet your father yourself.
After shutting down the lab, there's a place where I stashed all relevant documents.
You may have heard of them, and not many have,
but it's in the space used by the secret civil society of Calpheon known as the "Kalshurnise."
There you will find literature illegible to most common folk.
However, the blood of the Quturan flows in you, your highness. You shall have no trouble at all.

Summary I shut down the laboratory as we had planned earlier,
and reared these Quturan branches into trees.
For I had researched the Quturan for many years with him,
and rearing each branch into a tree was a simple task alone,
but the problem arose on how to hide such enormous trees.
Even the knowledge of Orzeca brought over by the king couldn't solve this conundrum.
Thankfully, from the legacy of the ancestors, I obtained knowledge
on "Maha's Veil," something from Orzekea, which predates the founding of Orzeca.
While it wasn't enough to hide something large like fortress, as written in the knowledge...
I succeeded in dedicating the rest of my remaining life into hiding this tree.

Summary After the king sealed away the roots of the Quturan in the Arid Land,
he returned to establish this laboratory with the knowledge gained from those same roots.
It was in that place... where he appeared to rear his absolute guard,
but, at the same time, it was also a fortress to protect your existence.
The king was unable to retrieve the children of the Arid Land as did the witch from the knowledge,
so he experimented with Valkyrie candidates who reacted to the branches of the Quturan.