Originally posted by dr.nathanbandeira:

Hello guys i could use a little help
I`ve been to the dark forest and found two burial chambers, explored every corner of both of them, but i only found 8 cores.
i`m sure i explored every corner because i walked around hugging the left wall, just to be sure i was going everywhere but found nothing.
My best guess is that somehow i could destroy some stones that are blocking some passages but i`ve tried everything including the pickaxe and nothing works.
Is that a bug or something?

You can't destroy the stones blocking passages, so don't waste time trying.

You are just experiencing the wonders of randomly generated burial chambers. I've had chambers that have yielded one or two cores; I've had others that have given me 15. Just find more and explore...