Cultivation: Start From Simplifying Martial Arts Techniques - Chapter 312 - : Despair

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?

- Description from Novelupdates

Year 2099, the world as we know it now advanced in technology. Learning has become easier, and so is transportation. But in this new advanced world there is undoubtedly problems, beings who want to use the new technology to bring chaos and strife to humanity. Xander, a 17 year old normal High school boy buys a new MMORPG game and through it, he improves his skills in all aspects. He lived a normal life until one day when his father, who abandoned him and his mother for a year came back, claiming to be the leader of a group of super humans. This was the day Xander’s life changed. He was told he will get a power to stop the enemy but what will it be? Is he even ready to take on such a responsibility? Nobody knew that this enemy group were in charge of G. CO, the creators of League of Guardians virtual MMORPG game. What they plan to use the game to accomplish was... absurd... but anyway, read to find out. Let’s Follow Xander on his journey as he becomes the strongest Super human and save humanity from doom. ... [You have killed level 51 reaper] [Do you wish to demonify, level 51 reaper?] “Yes.” [You have created a new demon, Lich] The ability to create demons from dead creatures. With this power he shall defeat his enemies and get his peaceful life back.

Caleb suffered an accident while driving a car that claimed his life. Only to reincarnate in an entirely different world. He thought that it was his second chance to climb the peak of life.However, he died in his second life at the age of five years old tragically. Then he was reincarnated again!He died in his third life at the age of fourteen years old; he died due to various reasons ranging from natural disasters to machinations of people.It was a vicious cycle of dying and reincarnating. His initial confidence and vigor were replaced by horror and fear. He can't seem to get past 18 years old! He noticed a pattern that he was dying before he could even reach adulthood. He didn't know whether his infinite reincarnation was a blessing or a curse.“Who can tell me why can't I get past 18 years old!?”The feeling of dying, again and again, pushed him to the brink of insanity. So Caleb made an oath that he would strive to live past 18 years old and break the vicious cycle! For that, he knew that he needed to give his everything, and do things he didn't want to do, to survive!'Wait how the hell did I get reincarnated in the body of an orc? Not only humans, but I can also reincarnate as a monster!? What's next? A slime? a goblin?' Caleb stared dazedly at the sky, full of questions....Caleb has reincarnated time and time again billions of times. After acquiring enough knowledge, combining different power systems of countless worlds, and strengthening his soul, he found a way to godhood.This is the story of a normal human living a true, eternal life! An actual god!

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?