I found like 1 relic so far I've been upgrading my storage by hunting but I can't find any of the relics. Just last night I found a relic hidden in a stone cavern you can see the relic right through a crack in the rock but I have no idea how to get to it
sometimes you need C4 to blow open stone doors.
sometimes you need to find a cave entrance, look for black spots on the map because those are caves and caverns.