Downhill Roller. The elemental's walking speed increases to 30 while moving downhill. If it moves at least 15 feet straight towards a target and then hits it with a slam attack on the same turn, the target takes an extra 7 (2d6) bludgeoning damage.
Earth Glide. The elemental can burrow through nonmagical, unworked earth and stone. While doing so, the elemental doesn't disturb the material it moves through.
False Appearance. While the elemental remains motionless, it is indistinguishable from a normal stone.
Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) bludgeoning damage.