“The Darkness” (2016)?
https://www.imdb.com/title/tt1878841/
Detailed plot summary on Wikipedia here:
https://en.wikipedia.org/wiki/The_Darkness_(film)
Quote from the IMDb synopsis:
“Mikey discovers a small cavern, where he finds rocks with glyphs on them.”
If you think that this is the movie you are looking for, then please select my answer as Best Answer by clicking on the “Select” button.
casspir Changed status to publish Jan 3, 2021