Multiattack

The elemental makes three Slam attacks, or it makes two Lob Stone attacks. If two Slam or Lob Stone attacks hit one creature, the target must succeed on a DC 16 STR save or be knocked prone.

Slam

_Melee Weapon Attack:_ +8 to hit, reach 10 ft., one target. _Hit:_ 14 (2d8+5) bludgeoning damage.

Lob Stone

_Ranged Weapon Attack:_ +8 to hit, range 20/60 ft., one target. _Hit:_ 21 (3d10+5) bludgeoning damage.