Six months ago, during the winter break,
as the Zombie Blade absorbed the cranial blood of Spider Woman, the relatively young Zombie Pituitary inside it experienced growth, becoming at least equivalent to the pituitary of a Pseudo-Person that's over a year old.
The machete it was merged with also gained more of a zombie's characteristics, striking right at Luo Di's fancy as a B-grade film enthusiast.
However, although Luo Di liked the knife's appearance, practicality still needed to be considered.
The two milk teeth initially scattered on the blade's surface seemed to Luo Di as if they might have other uses, perhaps changing the position of the teeth,
or even grow out some more to perfectly merge with the blade and exert their true function.
During the few months of his last semester in high school,
the Zombie Knife was like a child growing up, unexpectedly growing teeth on its own, and the teeth itself became more mature and even sharper.