Lin Li had previously had a discussion with Sendros about the Retribution Knight. The Retribution Knight was a legendary Death Knight, and the special thing about the Retribution Knight was that there could only be one Retribution Knight at any point in time. Once a Death Knight became a Retribution Knight, all the other Death Knights would stop evolving and voluntarily come forth to pledge their loyalty to this new Retribution Knight no matter how far away they had to travel to find it.
As these Death Knights became the loyal subjects of the Retribution Knight and stopped evolving, all the power they gained from battles would be transferred to this Retribution Knight so as to help it evolve faster. Hence, every Retribution Knight was scarily powerful, and merely the word legendary was not enough to describe them.
