Inside the Cave of Obscenity - Vol 3 Chapter 10: Priestess 4 (Tentacles, Impatience,

Kang Min-hyuk, the loser of the checkpoint, gained a high-level magical civilization and everything changed.

On the distant Tianxiu Planet, there exists a group of unusual and intelligent beings. They consist of neither children nor elders. They have neither birth nor real death. They are born into the world through an extremely special process and have managed to keep their fundamental memories of survival through their endless reincarnations.

They are the Tianxiu people.

For every Tianxiu person, if they find someone they like and want to bind as partners with each other — then they would have to go through a life or death Adult Ceremony. The winner of the ceremony will become the absolute dominant in this spousal relationship.

While the defeated one will be referred to as — Qizi.

- Description from Novelupdates

Killed in the apocalyptic world and reborn as his 18 year old self, Luke Greyson was given a second chance at life. A second chance to change everything and save his loved ones. With the knowledge of upcoming apocalypse, he will fight and kill to survive and to save his loved ones. From mediocrity, he will rise to become the strongest war god and feared by gods and devils alike.

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Lu Ze transmigrated to the interstellar era two thousand years later.
The previous owner of this body had lovey-dovey parents and a cute little sister. Although his cultivation talent was ordinary, his life was fulfilling. It could be said to be a dream start. Lu Ze was very happy.
However, as soon as he slept, he came to a strange dimension.
He almost got taken out trying to fight an one meter tall huge white rabbit. After making the arduous kill, Lu Ze found that things didn’t seem to be so simple.
After killing prey in this dimension, he could get little orbs that could be used for cultivation.
This was going to make him an eternal jungler.
But he seemed to be able to hope for domination of the cosmos and invincibility?