Stone Camouflage. The grick has advantage on Dexterity (Stealth) checks made to hide in rocky terrain.
Multiattack. The grick makes two attacks: one with its tail and one with its tentacles. If it hits with its tentacles, the grick can make one beak attack against the same target.
Tail. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit:11 (2d6 + 4) bludgeoning damage.
Tentacles. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit:22 (4d8 + 4) slashing damage.
Beak. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit:13 (2d8 + 4) piercing damage.
The wormlike grick waits unseen, blending in with the rock of the caves and caverns it haunts. Only when prey comes near does it rear up, its four barbed tentacles unfurling to reveal its hungry, snapping beak.