In fact, all professions are graded like that, but there exist other treasures or pills that couldn't be categorized as grades, such as universal treasures or the pill that gave him his physique.
That being said, the pills and weapons refined by cultivators are mainly divided into grades according to their value, ranging from Grade 1 to Grade 9.
Each grade has subdivisions: Lower tier, Normal tier, Higher tier, Supreme tier, Perfect tier, and Perfect tier with patterns.
This knife was a Grade 5 weapon, but he couldn't determine it just by looking at it. He had to use his qi on it.
Once it absorbed his qi, it would release a unique aura. Cultivators could easily identify a weapon's grade once its aura was released.
He injected his qi into it and felt it vibrate in his hand before releasing a unique shine. This was indeed a Grade 5 weapon because it had five shades in its shine.
