Immortality in the Myriad Realms

Chapters will range from 1500-2250 words.
Harem? Most likely.
Overpowered? Definitely.
System? Of sorts.
Anti-Hero Mc? Yes.
Killing? Lots.
Tyranny? All of it.
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Earth, a normal planet to the normal eye.
How will the world change when one singular person gains a power even gods wish for?
When he uncovers the secret clans of the world and quickly pushes forward Earth’s civilization?.. How will the planet fare with galactic alliances?
When he pioneers the path to the outer realms?… How will he lead the galactic alliances to combat the darkest powers of the universe?
When the universe is in trouble?… How will he deal with the Age of Destruction?!
How will one singular person, wage wars against gods, terraform lands, and keep his women safe at the same time?