Extra's Harem: Invincibility Starts with Marriage and lots of Children - Chapter 38 - Why not kill your husband yourself then?

William and his college class are ripped from Earth and thrown into Aethel, a world on the brink of collapse. Everyone gains incredible magical powers – except William. Mocked and underestimated, he’s an outcast among heroes. But William has a secret: an SSS-ranked skill that lets him travel to Aethel’s past. Learning lost magic from ancient masters, he’ll surpass his classmates and become the true savior Aethel needs. But can he overcome the dangers of the past and present to forge his own destiny? While others studied about the first mage, William could go back in time and see the first mage himself! While others dreamed of seeing a dragon, William could go back in time, hatch a legendary dragon egg and turn it into his puppy. While others used common materials to craft their items, William could go back in time and mine materials that weren’t find anywhere in Aethel anymore. Is it unfair? Perhaps, but William was not the type of person to not use the powers the universe gave him.

On the night when the savior of the wizarding world should have been born, Harry Potter died under the unforgivable curse.

The man who made almost all British wizards dare not call him by name, regained the wisdom and ambition that belonged to him from the Horcrux.

Darkness has completely enveloped the island of Great Britain.

Wizards are divided into high and low according to their bloodlines. Pure blood firmly holds the authority that belongs to the superior, and people called mudbloods can only be as humble as mud and trampled on throughout their lives.

The Ministry of Magic, which is supposed to enforce justice, is full of villains, and the castle, which is supposed to impart knowledge, is full of oppression.

In these dark times.

Jon Green, who came from across time, was brought into the exiled carriage that truly inherited the title of “Hogwarts”…

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- Description from novelbuddy

Mimizuku, a small girl with chains on her wrists and ankles and the numbers “332” branded onto her forehead, wanders into the Forest of Night seeking to be eaten by a monster. However, when the ruler of the monsters, the mysterious and beautiful “King of Night,” refuses to eat her, she tries to formulate a way to convince him otherwise.

The Great Thousand World. It is a place where numerous planes intersect, a place where many clans live and a place where a group of lords assemble. The Heavenly Sovereigns appear one by one from the Lower Planes and they will all display a legend that others would desire as they pursue the road of being a ruler in this boundless world.

In the Endless Fire Territory that the Flame Emperor controls, thousands of fire blazes through the heavens.

Inside the Martial Realm, the power of the Martial Ancestor frightens the heaven and the earth.

At the West Heaven Temple, the might of the Emperor of a Hundred Battles is absolute.

In the Northern Desolate Hill, a place filled with thousands of graves, the Immortal Owner rules the world.

A boy from the Northern Spiritual Realm comes out, riding on a Nine Netherworld Bird, as he charges into the brilliant and diverse world. Just who can rule over their destiny of their path on becoming a Great Ruler? In the Great Thousand World, many strive to become a Great Ruler.