Do you seek information regarding the Tetsusaiga, your father's heirloom sword? Or, perhaps...
A tree-demon!
Oh! Lord Sesshomaru, what's that?!
A two-thousand-year-old magnolia tree.
I see.
It is true. The sheaths of the swords, the Tetsusaiga and the Tenseiga- passed down from Sesshomaru's father- were carved from my very own boughs.
They were? (thinking) So, the sheaths for their swords came from this tree! They hold such strange powers- I can see why, after seeing this creature!
Bokuseno, perhaps you can explain the link to me... between Inuyasha and the Tetsusaiga.
(surprised) Inuyasha? Your younger brother?
Inuyasha's blood has changed. The first time, was when a demon bit and broke the Tetsusaiga; the second time, he had let go of Tetsusaiga while fighting me.
His scent wasn't that of a half-demon's. It was that of a pure demon's blood... like mine, and my father's.
His had the same scent? (chuckles) I have my doubts.
What do you mean by that?
Inuyasha is a half-demon, born between a demon and a human. He could never become a full-fledged demon. (pause) Sesshomaru, there is something that you, a pure-blooded demon, are capable of accomplishing, but which Inuyasha could never do.
... Go on.
... It is simple. I speak of protecting oneself.
"Protecting oneself?"
Yes- in battle, for instance. (pause) If you find yourself in a hopeless situation, you are able to remain calm. You never loose control of yourself.
(scoffs) It wouldn't be possible for me to fall into such a desperate situation.
(chuckles) No, I don't suppose you would. Inuyasha is another matter, however. If backed into a corner to the point where his life is in danger, his demon blood takes control of the body, and he transforms in order to save his life.
(to himself) That would explain his transformation.
Unfortunately for Inuyasha, the pure demon blood of his father is too strong for a half-demon such as himself.
What will the outcome be?
Well, in essence, the demon blood will devour his human soul. He will not be able to recognize himself. He will not be able to differentiate between friend or foe. He will simply kill... and, with repeated transformations, Inuyasha will eventually lose his soul. He will become a demon who only knows how to fight and kill... and he will continue to fight, until he is destroyed. (pause) I sincerely doubt that your father would have wished such a terrible fate upon his own son. That is why, he bequeathed Inuyasha the sword Tetsusaiga, to protect his soul.
(thinking) The Tetsusaiga protects him? So... If he releases the sword... he is doomed.
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