The grades of variant bodies are,
Mystic grade,
Ancient grade,
Celestial grade,
Origin grade.
Mystic grade is the weakest and origin grade is the strongest. A origin grade variant body can appear only on one person at a time. For another physique to appear, the existing person had to die.
There is no such restriction on other grades.
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Grades for all others
The grade of everything is divided from Tier 1 to Tier 6. Tier 1 is the weakest and Tier 6 is the strongest, and each Tier corresponds to a major realm.
This grade applicable for pills, formation, treasures etc..
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Minor path
A minor path is mostly related to professional works. Minor path doesn't have the same restriction as Major Path, a person can cultivate as many as they wish.
There is no benefit like acquiring life span and nirvana in minor path. But it increases something related to the path, like sword minor path increases the attack power of the user.
The grades of minor paths are,
Beginner
Master
God
Saint
Emperor.
In case of sword path: The first level is sword beginner and followed by sword master, sword god, sword saint and finally the sword emperor.
Every minor path is has the same realm as the above example, only their names will change like pill emperor or formation emperor.