Paladin

Paladin is the highest known rank of ability a Mage can achieve, second only to the Magic King. If two Paladin class magi battle each other it could put the world in danger. The next highest rank is Cardinal Class.

To get to paladin rank you must exile or passed the cardinal rank.

One example of Paladin class techique is suppressing your own magic to zero and then unleashing it in an instant. (Source: Trinity Seven Chapter 15 the ENGLISH version).