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Noah was using his Lifeblood Points to awaken and fuse his Skills!
Usually, sometimes Skills would fuse together to form new Skills that combined their effects, but now that his System had evolved, it seems that he could be able to step into greater types of enhancements, or even manually fuse Skills!
Even more, the Blood Progenitor had told Noah that many of the Skills were ripe to fuse, meaning that something new was about to happen.
"By fusing these Skills with the concept of Skill Trees and the three last Skill Trees that you should have gotten with each evolution Level you skipped, you will be able to get new Abilities more fitting for your current strength. This power has been designed like something you can upgrade continuously as you progress by using more Lifeblood Points, instead of simply being skill purchase like it seemed to be before…" said the Blood Progenitor.