The Sorcerer's Secret System Chapter 23

If Allen wants to evolve the bloodline of the Hill Giant, he must also meet two prerequisites.

First, the purity of ogre bloodline is ≥7%.

Second, physical attribute ≥20.

There were still 3 points missing in physical attributes, and the blood purity was not enough, so he had to give up on the evolution.

Since this approach didn't work, Allen had to settle for the next best thing and try "blood fusion".