For any creature, blood purity was one of the most important parameters for reaching new heights. It was something that didn't depend on the amount of energy, strong abilities, or unique body features, but blood purity could enhance each of these aspects.
Vampires had a whole new regeneration rate, Angels grew extra wings, and Axalts had greatly improved reflexes. Each race and each individual person had their own benefits from the increase in blood purity. However, for monsters, it was more important than for everyone else.
'Unlike the other races, every monster is kind of unique...' Wain inwardly muttered looking at Wolf whose aura had already increased significantly, 'They don't have an obvious development path as they are all too different, so the same monster with different blood purity, can be a completely new creature.'
Crackle.