This Japanese Monogatari Isn't Lame - Chapter 219 - 186. You said this world has... (8000-word goal achieved!)

The world where the Hero and the Demon King continue to oppose each other. The grand magic from the Hero and the Demon King cross over worlds and exploded in the classroom of a certain high school.

The students who died in the explosion will be reincarnated in a different world. The protagonist, who had the lowest reputation in the class, was reincarnated into a spider. Nevertheless, she adapted quickly to the present condition with strong willpower.

This is a story of she who has become a spider trying whatever she can to live.

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

Allen, an eight-year-old boy from a poor family in the royal capital, is living a poor but happy life together with his mother. One day, however, memories of his previous life suddenly come back to him and he remembers that he is in an dating sim game and that the capital will be destroyed by war if he doesn’t do something about it. If this continues, both he and his mother will be killed! With a sense of urgency, he decides to rise to the occasion in order to save his precious mother’s life and save his favorite character, the villainous young lady Anastasia, the only girl he liked in the game, from her all too tragic and ruinous end. This is the story of a man who isn’t even a character in the game, but who strives with his steely determination and uses all the knowledge he has to turn overcome fate!

“Waking up from sleep, Ye Feng realized that he had transmigrated to a world where the cities had awakened and the whole world lived in symbiotic relations.

Every young person of age would choose a symbiote that was compatible with them.

Some people built a symbiotic relationship with the Ancient Great Dragon of the Origins. After they matured, they could shatter the earth with their dragon breaths.

Some people built a symbiotic relationship with the Twelve Winged Flaming Angel. After they matured, their sacred light shone upon the world.

Some people built a root-level symbiotic relationship with Succubuses. After they matured, they became insanely attractive and charmed the world.

However, Ye Feng’s symbiote was the most unremarkable creature, a Slime?!

Fortunately, he activated the system and awakened the six great sequences at the beginning!

[Perception]: Your ability to sense danger and opportunities is amplified significantly.

[Devour]: You can devour any living being that is smaller than yourself to increase the size of your own body.

[Split]: You can split your body into smaller parts. Each part will retain part of the initial body’s abilities.

[Regenerate]: The recovery capabilities of your various stats are amplified significantly, at the same time your adaptability is increased rapidly as well.

[Mimic]: Your symbiote will evolve at an accelerated pace. Every time it evolves, there is a chance that it can awaken a new ability.

Watch how Ye Feng’s Slime grows to rule the world in the end…