Khaine the Boulders are spawning Underground in the wasteland...it's really freaky, they make huge stable cavern pockets that you can find Uranium, Plutonium, and Titanium in the walls. I saw this weirdness when I slid into a 'half-block' while mining looking for more ore.
My reaction was...What...the HELL...is THAT? Had to stare at it trying to figure out what it was..half the rocks vanish when you smash a rock near it..half become 'untouchable' you can walk on them, they block movement but have zero ability to mine them. Bizarre. I was silly enough to play the 12k map, I've found 6 or 7 demon portals..can't find the bunkers...any hint as to the direction I should look?