The Reality Modifier in Shrouding the Heavens

I transmigrated into the world of my favorite trilogy, Shrouding the Heavens. I know this world very well, but it is incredibly dangerous, with forbidden-zone supremes, the Immortal Realm and foreign realms, and all kinds of cosmic crises caused by the strange race. But what does my golden finger mean? It's just a blue Cosmic Cube? It's called the Perfect Cosmic Cube from the Beyond Realm. What is this thing? What can it do? What is Beyond Energy? What do I do if the forbidden-zone supremes unleash a dark upheaval? If only I were a Fully Realized Saintly Body. Hm! What's going on? I became a Fully Realized Saintly Body? The kind where I skip the curse, cultivation, and tribulation, and go straight to full mastery? The Immortal Realm is shattered? No problem, I'll create another one, or even countless Immortal Realms. The strange race can revive infinitely? Then I'll change that rule. Once I completely fuse with the Beyond Energy inside the blue cube, my power will be enough to rewrite the entire real universe and alter every rule. Whatever I think becomes reality, becomes truth. I will conquer time, space, and every law and rule, revive life at will, and even reshape the entire omniverse. I will rise above all things and become the master of the Beyond Realm, the Beyonder. The entire Transcendent God Clan will be my servants.