Multiattack

The arborcyte makes two thorn vine attacks plus one animated tendril attack for each tendril it can see that has been created through its Shearing trait.

Thorn Vine

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 18 (3d8 + 5) piercing damage, and the target is grappled (escape DC 16). Until this grapple ends, the target takes 7 (2d6) acid damage at the start of each of the arborcyte's turns, and tendril attacks against the target have advantage. The arborcyte can grapple up to two creatures at one time.

Animated Tendril

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 9 (1d8 + 5) piercing damage.