Sand Glide. The elemental can burrow through non solid sand. While doing so the elemental doesn't disturb the material it moves through.
Multiattack. The elemental makes two slam attacks. Slam. Melee Weapon Attacks: +8 to hit, reach 5ft., one target. Hit: 14 (2d8+5) bludgeoning damage. Sandblast (Recharge 4-6). The elemental blasts sand in a 15 foot cone in any direction. Any creature within that cone must make a DC 15 Dexterity saving throw or take 15 (3d8+2) bludgeoning damage and be thrown up to 20 feet away from the elemental and knocked prone. On a success the target takes half the damage and is not flung or knocked prone.