Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 2 - 2-11. Labyrinth of Demon (4)

The King of Hell sentences you to death by midnight, but I can ensure that you live past morning.

The young man, Qin Lang, received the inheritance of a poison school by chance. He uses poison to kill people, uses poison to save people and he uses poison to chase beauties. With body of ancient extinct poison and a body of a martial artist, he walks around the city, and wanders around in the underworld.

- Description from Novelupdates

After Wang Mang died, he turned into a giant python and evolved like crazy!With the help of his family, he grew bigger and bigger! From the first few meters to tens of meters, and then to hundreds of meters!From Burmese Python to Titan Python, and then to Deep Sea Python! When Wang Mang's size reached hundreds of meters, the earth took a sudden change and the disaster came...

There’s a legendary Bishoujo Game that has become popular among Japanese gentlemen.

The world had started doomsday, and I struggled for a year, before I died under an enchanted beast’s claw. Heaven has given me another chance, back a day before the end happen. Will I be able to change my fate, and that of my loved ones? Now, I will start my journey on becoming the strongest on the planet that the Gods have changed into a game world.

- Description from Novelupdates