Forgotten Title Cultivator can't die in starting area and trains before his time is out

[TheOneWho]

Like the title says, I'm trying to remember a story where a reborn cultivator can't die in his starting area and trains before his time is out. Where people who found him thought he was immortal and thought he is way stronger than he currently is. I can't remember if its a novel or a Manhwa/Manhua.

 

[CharaGod]

"Realizing This Is A Wuxia World After Cultivating For 300 Years"​

im not sure about people think he stronger than he actually is but it does have a barrier that help him for the first 300 years of cultivating before he had to go out

 

[TheOneWho]

"Realizing This Is A Wuxia World After Cultivating For 300 Years"​

im not sure about people think he stronger than he actually is but it does have a barrier that help him for the first 300 years of cultivating before he had to go out

Just looked at and it wasn't it. But still seem interesting enough so thanks!