Multiattack

Three Slams or two Skipping Stones.

Slam

Melee Weapon Attack: +9 to hit, 10 ft., one target, 15 (2d8+6) bludgeoning damage.

Skipping Stone

Ranged Weapon Attack: +9 to hit 20/60' one target 15 (2d8+6) bludgeoning damage and the stone bounces to another creature within 10 ft. of target. That creature must make DC 16 Dex save or take 9 (2d8) bludgeoning damage.