MTL - The Strong Beauty is a Goddess in Showbiz - Chapter 445 found it

Ronan was just another overworked office drone until a sudden death transported him to a vast, unfamiliar fantasy world—alone, invincible, and armed with absurdly powerful abilities from a game he once played. But reality isn't as simple as a game, and after days of wandering the unending Nim Forest without finding civilization, his optimism begins to fade.Just as isolation threatens to wear him down, he encounters Frieren, a quiet elf girl hiding in the bushes. Their meeting marks the first step on a path neither of them fully understands, in a world that seems empty, yet full of mystery.

But things seem to be different from the history that he knows.In this strange land, ancient legends walk the earth. Here Witches, Manticores, Vampires, Werewolves, Sirens, Dragons and Krakens are all terrifyingly real.As if that weren’t enough, this is also the age of legendary rulers—Baldwin, Saladin, and Richard the Lionheart —each destined to shape history in a new wave of Crusades.Amidst bloodshed and glory, Lothar must use his only advantage—his Gacha System—to build his territory, summon legendary units, and carve out his legacy in a world where ambition reigns and power speaks.

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

[Warning: r18, smut, MC does morally questionable things][Disclaimer: The Gods and Goddesses in the story's world have absolutely no relation to any Gods that are worshipped in the real world. The purpose they serve is also entirely different.]~Even if you're someone who typically doesn't enjoy works with smut, I request you to give this novel a chance (provided you're 18 or older of course). It would be awesome if you could at least read Volume 1 before deciding whether or not this is your cup of tea.~This is an action + kingdom-building story where the MC and his kingdom (Realm) are metaphorically powered by his lustful acts.The story begins with Hiro's (the MC) transmigration into a magical world. At first glance, this “World” might look quite similar to many other fantasy worlds that you've come across on your reading adventures. Status screens, levels, classes, gods, kingdoms, elves - all that good stuff.But it will soon become clear that this World has its own “Rules”. These (mostly) game-like Rules will bring out unique character interactions. They will be what differentiates the World in my story from other similar fantasy worlds.Now about the characters - specifically the main character.The MC (Hiro) will be thrust into the role of Ruler in the new World right off the bat. He starts with a bottom-tier, barebones realm and makes his way to the top.I'm going to say this right away - Hiro is a deeply flawed character at the start. Yes he might be overpowered and good at getting things he wants, but that does not make him flawless.Hiro has glaring emotional flaws at the beginning. He is intelligent but not in the emotional sense. He is lustful but not truly loving. He is apathetic towards death (both of himself and of others).The women who surround him will also have their own problems, both internal and external.As the story progresses, it won't just be the MC and his realm growing in power.Hiro and his harem will also mature emotionally. Hiro's character growth will be a slow, grueling burn. It isn't going to be a smooth straight line from point A to point B.But when it finally does happen, it will be worth it.That's all from me, your author. I hope you enjoy the ride.P.S - Power stones, golden tickets, gifts, adding this to library, reviews, comments, paragraph comments - all these things help immensely and are greatly appreciated.Thanks and Enjoy! :)