Naruto: The Outsider's Resolve - Chapter 3.1 (090):

After Xia Feng transmigrated, his heart was mysteriously removed.In its place, a defective demon heart capable of sustaining life only for eighteen years was implanted.This is a magical heart that can sync with the power level of its target.To stay alive, he bound himself to the ultimate villain of the future, a Destructive Witch who was destined to destroy the world.The stronger the Destructive Witch becomes, the stronger he becomes!Thus, Xia Feng realized, it's not my fault for stirring up trouble: “Miss Witch, I admit you're strong, but not strong enough!”

Dane Harper's life was a monotonous grind. Stuck in a soul-sucking 9-to-9 job with barely any time to breathe, his only escape was the world of visual novels. From anime to manga, light novels to webnovels, Dane had consumed it all, but nothing compared to his ultimate obsession: Harem, Dragons, and Deities (HDXD).This legendary visual novel was a masterpiece of high fantasy, packed with detailed lore, jaw-dropping twists, and, of course, an insane harem of monster girls and powerful women.Dane had spent nearly 7,000 hours playing it, chasing every ending possible, especially the legendary [Overlord of Humanity Ending], where the protagonist builds a massive harem and spreads his superior genes across the HDXD universe.But when a cosmic accident caused by a mischievous witch-in-training, Beatrice, wipes out the entire human universe, Dane's life takes an unexpected turn.As the first soul to be reincarnated, Dane is offered two wishes by Beatrice: a world of his choosing and a fragment of her power. Without hesitation, Dane chooses the world of HDXD, a place he knows inside and out, and a unique ability to help him survive: the Omni Harem System. This system not only helps him level up and gain unique powers but also guides him in building the ultimate harem.Now, reborn as some random extra of this hellish game, Dane is ready to live out his wildest fantasies. His life goal, walk over the MC, and replace him... But this isn't just a game anymore; it's real life, and the stakes are higher than ever.From battling dragons and deities to navigating the complex personalities of the women around him, Dane must use his knowledge of HDXD and his new powers to carve out his destiny without getting curve stomp by the overpowered people around him.But let's be real, becoming the Overlord of Humanity isn’t going to be a walk in the park. This is HDXD we’re talking about; a world where one wrong move can lead to a bad ending so messed up it'll haunt your dreams.As such, every step towards that ending requires heart, commitment, and sheer will, and you best believe Dane is aiming for that ending at all costs.

A Consort seeks prosperity.A Shepherd cloaked in yellow wages war.A Prosthesis-wielder cries out for retribution.Shadows tremble in the depths, encompassed worlds obscuring the many dangerous secrets of history. Might they be unraveled, all ways of life would be threatened. But to climb higher requires risks, to seek the light requires a Gambit of Lifetimes.Only when one determines themselves capable of risking it all, can all prosper.

Lin Wudao has traversed, and there is an invincible corpse collection system.

As long as you collect the corpses for the strong, you can get the things they owned or touched as rewards during their lifetime, and the obtained items are still strengthened.

Lowest, ten times stronger!

[You collected the corpse of the great emperor Jiang Taichu, and gained ten thousand years of cultivation! 】

[You collected the body of your fiancée Jiang Qingxue, obtained the Zichen Sword, a humane spirit weapon, and after strengthening it ten times, it was upgraded to become an extreme spirit weapon, the Xuantian Ancient Sword! 】

[You collected the bones of an immortal, obtained a ray of immortal origin, enhanced it by 100,000 times, and upgraded it to become the original origin of Hongmeng. After refining it, you can be promoted to the immortal emperor! 】

…

Since obtaining the invincible corpse collection system, Lin Wudao has embarked on an invincible road that can push through the ages and suppress the heavens.

- Description from novelbuddy