Ichiban Ushiro no Daimaou - Volume 2, Chapter 3 — The Three Keys

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?

Yeon-woo had a twin brother who disappeared five years ago. One day, a pocket watch left by his brother returned to his possession. Inside, he found a hidden diary in which was recorded “By the time you hear this, I guess I will be already dead….”

A strange event happened in Blue Star, a large number of Blue Star people were affected by a mysterious force, and their souls temporarily traveled to another world.

It’s a dark, weird world

Not only are the prices extremely high, but there are also many evil spirits quietly appearing. At the same time, various forces are fighting with each other, and the people of the lower classes are suffering.

Yang Fangben, the attending physician of the mental hospital, also traveled through a strange incident.

Fortunately, he found that he had awakened a proficiency panel.

As long as you keep refreshing your proficiency, you can improve your own realm.

He grew up secretly, with corpses piled up under his feet, and he unknowingly embarked on a path of sagehood.

- Description from novelbuddy

Ban Yu-won can understand all the languages in existence. He was able to translate every language, modify it.

As a child, when Ban Yu-won first learned about the existence of the fictional building called the Tower of Babel in the Bible, his respectable grandfather told him it was their ancestors who built it.

“The Tower of Babel was completed without collapse, and people have the wrong idea.”

One day, out of the blue, the Union Academy practical exam began. Finding traces of his ancestors at the academy, Ban Yu-won decides to enroll in the academy full of monsters.