I Sacrificed the System from the Start, and I Will Eventually Become Invincible

Synopsis: [Villain protagonist + no female lead + Age of Declining Dharma + vast worldbuilding + ruthless and decisive] In the boundless universe, galaxies are born and perish in the blink of an eye, like fleeting motes of light, insignificant as dust. This is an age when spiritual energy has run dry and all worlds have fallen into ruin. The path to immortality is severed, and lifespans no longer stretch through eternity. Luo Chenfeng unexpectedly transmigrates into the boundless world of immortal cultivation. Amid an unknown darkness, he dreams through ten thousand years and masters the Primordial Origin Method, the first law of creation. From the start, he obtains the God and Demon System upon entering the world. He then uses the Primordial Origin Method to see through the illusion and uncover the truth behind the God and Demon System: it is nothing more than the spirit of a mysterious ancient realm. So he plots from the start, sacrifices the God and Demon System to take its place, and takes control of the mysterious ancient realm, using all living beings as sacrifices to develop the realm and acquire resources. Later, Luo Chenfeng comprehends the essence of the Great Dao, opens the nine great hidden realms within the human body, and creates a new cultivation system, his combat prowess unmatched across past, present, and future. In the Age of Declining Dharma, he beheads holy sons, slays emperors, suppresses divine kingdoms, and pacifies forbidden zones. He breaks the shackles of heaven and earth in this declining age, fighting until the great era withers, until the ancient road to immortality wails, until no one in all the worlds dares claim supremacy. With me, there can be no defeat. He crushes every hidden source behind the scenes, tramples eternal reincarnation, creates the ages, escapes the wheel of fate and karma, and breaks free of rules and order. He becomes supreme among all worlds, resounding through past, present, and future, and earns the title of the unrivaled one.