Earth Glide A living boulder can Burrow through earthen matter, including rock. When it does so, it moves at its full burrow Speed, leaving no tunnels or signs of its passing.
Rolling Charge◆◆ The living boulder Strides twice, and can then make a Strike with its jaws. This jaws Strike gains Knockdown.
Source: Pathfinder Monster Core 2
Running this fight? Add the living boulder to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.