First mentioned in chapter 2125, when the members of Mad Beast Legion was mentioned to have undergone Bloodline Replacement.
By undergoing a unmentioned method, players are able to replace their bloodlines. This resuults in their Life Ratings increasing beyond normal human race players, and rivaling that of Demon Race players. They gain far more to their Basic Attributes per level up as well. Due to these improvements, players will have increased movement speed, attack speed and reaction speed.
The flaw is that players will experience an intense difficulty when they attempt their future class promotions.