Multiattack

Two Whomping Slam or Rock attacks. If both Slams hit 1 target each creature within 5 ft. of target: 9 (2d8) bludgeoning damage and knocked prone (DC 15 Dex negates damage and prone).

Whomping Slam

Melee Weapon Attack: +8 to hit, 10 ft., one target, 18 (3d8+5) bludgeoning damage and if the target is a Large or smaller creature it must make DC 15 Str save or be knocked prone.

Rock

Ranged Weapon Attack: +8 to hit 60/180' one target 16 (2d10+5) bludgeoning damage.

Fossil Barrage (Recharge 6)

Stone shards in 30' cone. Each creature in area: 28 (8d6) piercing damage (DC 15 Dex half).