Suterareta Yuusha no Eiyuutan - Story 3-28『Revenge』

It begins on the mountain.

With the glint of a knife, a flash of steel in the hands of a sworn brother. A betrayal.

Stabbed and pushed down the mountain, Zi Chen lied within the red-stained snow, left to die.

This is where it begins; he is given life by lightning,
baptized by thunder.

Those who had once betrayed him should all suffer in his cruel revenge.

- Description from Novelupdates

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

This is a vast and powerful wizarding world community.

Powerful wizards willfully capture gods, conquer planes, and transform civilizations.

Lin En came to this world and after being exposed to the power of wizards, he gradually realized that knowledge is power and power is truth.

On the road of pursuing the truth, I will always be a humble apprentice.

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Keywords: wizard, development, farming, multiple planes, not the Virgin

- Description from novelbuddy