Green Leader, Blue Lord.
Green Quality usually represents the leader of a monster group or a mutated, rare individual.
Blue Quality, on the other hand, sits at the top of the food chain within a territory, and these monsters are almost the rarest quality that the majority of Beast Tamers can come into contact with.
As for Purple Overlord Quality, it's somewhat exceptional, even Chou Lao's Azure Sea Emperor Crocodile is only of Purple Quality.
Speaking of risk levels, I cannot yet handle the evolution routes of Purple Overlord-level creatures at this stage.
Chen Xing has now unlocked nine evolution routes of Blue Quality for the Twin-fiend Dogs, and after considering the name of the species post-evolution and the needed Secret Treasures, he eventually chose an evolution route called 'Vajra Mingwang Beast.'