In the event of death, there is a 1:10,000 chance that you will reincarnate in a world not your own and Retain your Ego; that is, your memories and Mental Self.
In that chance, there is a 1:10,000 chance that you will be given some sort of ability; the basic types are skills, or maybe talent, and these are called Classes, such as the famous 'Hero' to the infamous 'Maou' or 'Demon King'.
Then, there's... well, then there's James. James is an idiot savant, essentially, and so, thinking it's a dream and that he'll wake up soon anyway, he chooses 'nothing'.
He simply refuses to choose, and sits around in the Spirit Realm, meditating, for 100,000 years; in this way, he develops his own skills, instead of accepting one from the Gods.
Now, there's no going back.
After all, I didn't say his luck was 'Good' Luck, Did I?
The main character is reincarnated as a baby, where he's born into a royal family
"Another Reincarnation novel?"
But, he is transported into another world, after already being reincarnated
"Oh so I got Isekai'd? Really?"
The new world have magic, Martial arts and skills that he never saw before, a whole new world ahead of him.
"Okay now I am excited, I will have some insane powers, this is going to be a fun ride"
And when he was just kid, he had to play a dead game. A game so dangerous people had to kill their own friends and teammates
"Wait wait wait, WHATT! What do you mean a dead game? Can't you just write me into a peaceful and fun world?
Okay look iam writing here, could you stop interrupting me? I could make it worse for you, do you want that?
...
Good. And as I was saying, he had to play a game, a game that was designed to put psychological stress into someone.
This novel is a mix of everything, so just click the first chapter and start reading. Okay now say the last part
...
SAYY ITT
"I-If you love fantasy world with rich worldbuilding, this novel is made for you. P-P-Please read my story"