True Essence (真气, zhenqi) can be divided in 3 grades, from strongest to weakest:
SuperiorIntermediateInferior
Higher the quality of one's true essence, more clear it would be and further one would be able to climb in the future. The grade of one's true essence reflects the quality of one's cultivation technique. It is said that in order to cultivate superior true essence, it is required a god or saint cultivation technique. For that reason, superior essence qi is exceedingly rare.
Superior grade true essence has many wonderful uses such as healing capabilities and protecting the user from poison.
Heaven's Path True Essence is a superior grade true essence cultivated from the Heaven's Path Cultivation Technique created by Zhang Xuan. Which Kareem and Veronica uses.
Techniques Grades and Armaments Grades
Cultivation and Battle Techniques, and Armaments can be divided in 7 grades, and each grade is further divided into 4 tiers.
Low
Intermediate
High
Pinnacle
Mortal
Requires one to be at Fighter realm.
Phantom
Requires one to be at the higher dans of the Fighter Realm.
Spirit
Requires one to be at the higher dans of the Fighter Realm.
Saint
Requires one to be at Transcendent Mortal Realm.
Great Sage
Requires one to be at Great Sage Realm.
Ancient Sage
Requires one to be at Ancient Sage Realm.
Immortal
Requires one to be at Immortal Realm.
God
Requires one to be at God Realm.
For a Battle Technique, there is the concept of mastery as well (i.e. how adept you are at using the technique). The higher the rank of the battle technique, the harder it is to gain mastery in it. Mastery is divided into :
Novice
Initiate
Minor
Accomplishment
Major Accomplishment
Consummation.