The Power scale follows 13 Baptisms, Baptisms from 1-10 consist of three barriers. The barriers are referred to as Three Trials.
The Baptism system is only applicable to Witches and Sorcerers. (or magic users). Not supernatural beings such as Hunters, Kitsunes, wolves,Vampires, etc.
In order to achieve baptism a person must develop the mind (Mental arts and knowledge), body (Magic pool and Physique), or Spirit/Soul (Interchangeable)
to develop all thee categories and achieve a baptism is considered a perfect baptism, However, a person does not have to be equal in all three categories to achieve a baptism.
Benefits of a baptism: The world laws are bestowed upon the magic user during a baptism, during that time the worlds shows the magic user advance comprehensible knowledge on subjects that they have learned prior to their baptism.
The baptism enhances the soul, physique, and magic pool.
the 11th-13th Baptism requirements, are unknown to modern magic users, However there are some who have achieved such heights through raw power.
Not every magic user in the world accepts the 13 Baptism system, and in some places like the British wizarding world. It is widely suppressed and taboo.
1st-7th baptism. Like the original harry potter power scale is Arbitrary. And the battle outcome varies.