Spider Climb. The aartuk can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Spellcasting (Psionics). The aartuk casts one of the following spells, requiring no spell components and using Wisdom as the spellcasting ability (spell save DC 12):

1/day each: calm emotions, detect magic, sending

Multiattack. The aartuk makes two Branch attacks, two Radiant Pellet attacks, or one of each.

Branch. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit:11 (2d6 + 4) bludgeoning damage.

Radiant Pellet. Ranged Spell Attack: +4 to hit, range 60 ft., one target. Hit:10 (4d4) radiant damage.

Tongue (Recharge). The aartuk tries to use its gooey tongue to snare one Large or smaller creature it can see within 30 feet of itself. The target must make a DC 12 Dexterity saving throw. On a failed save, the target is grappled by the tongue (escape DC 14) and pulled up to 25 feet toward the aartuk. The tongue can grapple one creature at a time.