Insect-controlling magecraft was the magic Zouken Matou used to mimic a human form.
Zouken Matou's body was a mass of insects, with even his human functions operated by worms.
His original flesh had perished long ago. Once his current body decayed or was damaged, he could consume another person's flesh as a replacement and resurrect himself.
As long as his true body was not destroyed, he could continue living.
Zouken Matou's true body was a Crest Worm created from a fragment of the Holy Grail. For years, it had remained hidden around Sakura Matou's heart.
Normally, it functioned entirely as part of her nervous system, only gaining consciousness after the body acting outside had been completely destroyed.
And not long ago, Zouken Matou's external body had been destroyed by Sasuke.
The entire Worm Pit had also been purged by Sasuke's black flames!
Thus, the Zouken Matou hidden around Sakura Matou's heart had begun to regain consciousness.
However, the instant Zouken Matou regained awareness, Sasuke gouged him out with Chidori Sharp Spear!
That was the power of the Sharingan.
Tonight, Sasuke had already noticed that something was wrong with Sakura Matou.
A mana fluctuation that did not belong to her had been hiding beside her heart.
And that mana fluctuation happened to match Zouken Matou's.
Sasuke recalled the characteristics of Crest Worms that Illya had told him about, so he suspected that this thing was Zouken Matou.
Now, it seemed he had been right.
At this moment, Zouken Matou's true body, in the form of a Crest Worm, had already been paralyzed by Sasuke's Chidori Sharp Spear.
Zouken Matou had never imagined that Sasuke would discover him—and so decisively gouge him out.
If Zouken Matou had been given even a little more time, he would have drawn close to Sakura Matou's