The spirit fruit cultivated by Sai entered David's stomach, and gentle yet immense energy surged through his body.
David's heart had been left for last because it was no ordinary heart.
His heart had already undergone one transformation. Black Dragon Alexis had fused the Heart of God with it, allowing his heart to gain some of a deity's functions ahead of time.
But by now, this heart, which possessed some of a deity's functions, could no longer keep pace with David's rate of improvement.
By comparison, David's "demigod body" was far stronger than a heart possessing some of a deity's functions, mainly because his "demigod body" was simply too monstrous.
The Destruction Rule formed by fusing the two foundational rules—the Power Rule and the Speed Rule—not only possessed the abilities of both foundational rules, but surpassed them to become an even more powerful ability.
This allowed the "demigod body" composed of "Destruction Energy" to surpass the divine bodies of ordinary gods in certain respects.
That was the advantage of laying a solid foundation. If David had specialized in the Black Dragon Power Rule or chosen another rule, he might have attained godhood earlier, but his strength could never have compared to his current "demigod body."
Destruction Energy flowed into his heart, covering the energy of the Heart of God. His heart temporarily ceased functioning.
This process was extremely dangerous. The slightest problem during the transformation could prove fatal.
Once the heart stopped, the body's vitality also weakened rapidly. If it lasted too long, his life would likewise be in danger.
However, David had no such concern. Strands of Immortal Vitality flowed from his bones into his "demigod body," keeping its vitality at its peak.
Perhaps because his heart had been transformed by the Heart of God, this demigod transformation of