There are two requirements for a Rank 3 High Human to reach the realm of the Rank 4. First, fill the High Soul to the required amount of 1,000, and second, in the High Heaven Race standard, have all Basic Stats reflect the number of 1. However, Grimm is not a typical High Human. He’s a new High Human subclass that relied upon the devouring of bloodlines for strengthening and advancement, and being such, his set of prerequisites are different and had much stricter demands.
First, instead of 1 to ALL Stats, his prerequisite for Rank 4 advancement is a whopping 10, 9 points higher than the average figure, and the reason behind this is because the goal of the Bloodline Cultivation Method upon reaching the 4th Rank, through the continuous devouring of several Bloodlines, is to turn its practit
