SOLVED. Litrpg, Portal Fantasy. Time travel through the portal. Veteran mc, portal behind a sealed double brick wall in the basement.

[Daybreak]

mc a military veteran buys a house, in the basement finds a double sealed brick wall with the letter knifed to the wall that the previous owner warned him that his son was lost in the portal so don't go in but he goes with guns and such to a primitive earth future year range 2020 and up i just forgot the name of it

[Kris]

A Door Into Time by Shawn Inmon?

Google search of Goodreads:
site:goodreads.com portal fantasy "time travel" "veteran"

How is this "litrpg" different from a typical fantasy novel?

[Daybreak]

tnx man, i thought there was status sheets and stuff in the book, it was a long time ago that i came across this book

[Kris]

Amazon's preview of A Door Into Time by Shawn Inmon:

- https://www.amazon.com/Door-Into-Time...

Do you think this is your book?
Around what year did you read this book?

[Daybreak]

yup, it's the one

[Kris]

Great! Glad you found your book, Daybreak.