Multiattack

Two Tentacle Slam or Acid Spit attacks.

Boulder Bash (Defensive Form Only)

Melee Weapon Attack: +5 to hit, 5 ft., one target, 14 (2d10+3) bludgeoning damage and target knocked prone (DC 13 Str not prone).

Tentacle Slam

Melee Weapon Attack: +5 to hit, 5 ft., one target, 8 (2d4+3) bludgeoning damage + 3 (1d6) acid.

Spit Acid

Ranged Weapon Attack: +4 to hit 20/60' one target 9 (2d6+2) acid. A creature hit by this takes additional 3 (1d6) acid at the start of its next turn.