Multiattack

The frostveil makes two Frozen Tendril attacks. If both attacks hit a Medium or smaller target, the target is grappled (escape DC 15), and the frostveil uses Snowy Engulf on it.

Frozen Tendril

Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 9 (1d8 + 5) bludgeoning damage plus 3 (1d6) cold damage.

Snowy Engulf

The frostveil engulfs a Medium or smaller creature grappled by it. The engulfed target is blinded and restrained, and it must succeed on a DC 15 Constitution saving throw at the start of each of the frostveil's turns or take 4 (1d8) acid damage and 3 (1d6) cold damage. If the frostveil moves, the engulfed target moves with it. The frostveil can have only one creature engulfed at a time.

Spirit Spores (Recharge 6)

The frostveil releases a puff of psychotropic spores around itself. Each creature within 10 feet of the frostveil must make a DC 15 Constitution saving throw. On a failure, a creature takes 21 (6d6) cold damage and is incapacitated for 1 minute. On a success, a creature takes half the damage and isn't incapacitated. When an incapacitated creature moves, it moves in a random direction. An incapacitated creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.