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

Swarm. The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening large enough for a single aartuk weedling. The swarm can’t regain hit points or gain temporary hit points.

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: 17 (4d6 + 3) bludgeoning damage.

Radiant Pellet. Ranged Spell Attack: +4 to hit, range 60 ft., one target. Hit: 16 (6d4+ 1) radiant damage.

Tongue (Recharge 6). The aartuk tries to use its gooey tongue to snare one Medium or smaller creature it can see within 30 feet of itself. The target must make a DC 11 Dexterity saving throw. On a failed save, the target is grappled by the tongue (escape DC 12) and pulled up to 25 feet toward the aartuk. The tongue can grapple one creature at a time.