Noah knew the flaws of the Elemental Forging method better than anyone else. He had long since surpassed the previous experts in that field. He was a pioneer when it came to that inscription method.
One of the most significant flaws in the Elemental Forging method was that inscribing the same item multiple times would lead to a weaker structure. The final product wouldn't carry the intended power either.
Noah had fused his body with a Light-devouring Dragon when he was only a human cultivator. In theory, he had already used the first round of forging.
That was the reason why he had held back from improving his bloodline. He had managed to link the fourth center of power to his heart, but that wasn't a proper forging. His body had taken care of fusing the two organs for him.
Yet, Noah's body had gone through many changes since the fusion with the magical beast. It had evolved to express his individuality, and it had also entirely changed after attuning with the black star.