Shadow's Oath - Chapter 76

Ronnie, a college student with a boring life has everything around him change when his whole world is turned upside down by a woman he accidentally summons while trying to summon a magical familiar as a game.His peaceful and tranquil days are disrupted as he tries to help her fit into human society while also searching for a way to break their bond.Hell further breaks loose when he discovers that his familiar is indeed the demon queen and mysterious forces start trying to eliminate him for reasons unknown.He struggles to protect himself, adjusting to having a demon queen in his life, and understanding his growing feelings for her.

twelve years ago.

The queen gave birth to a princess, who claimed to be the prince, named Xia Shimin.

three years ago.

Xia Shimin was established as the prince, and made a marriage contract with the current Taifu’s daughter to stabilize the imperial power.

…

Zhang Ronghua had traveled through time when she was born, hereditary and hereditary, her roots were straight and her roots were straight, and she was an upright Forbidden Army. He had been in the palace for fifteen years, and his talent would increase a little with each passing day.

Seeing that the prince’s wedding was getting closer, he accidentally broke the body of the prince’s daughter.

The night of the wedding.

Prince: “You can replace the lonely bridal chamber!”

- Description from novelbuddy

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?

Frascoia Continent… Various races like Celestials, Demons, Humans, Monsters, Elves, Dwarves, and so on occupied this continent.

Humans and the other races lived on the mainland of the continent while the Celestials and Demons lived in Heaven and Purgatory, respectively.

Within the Demons, a prodigy named Azaroth rose quickly, even by demons' standards, to the point of being dubbed a Demon God. There was only one person above him within the demons: The Great Demon Venerable, the Demons' Supreme Godfather.

Azaroth's extraordinary talent never had the chance to blossom to its full potential; a terrible calamity struck him down and he died soon after. But was this calamity just misfortune or was it hiding an opportunity for him?

Near his deathbed, he prepared for his future ascent to achieve his lofty goal.

Millions of years had passed after Demon God Azaroth's demise and now a young aristocrat called Edwin Rhodes came across a mysterious cave.