Multiattack. The swamp lily makes two root attacks.

Root. Melee Weapon Attack: +6 to hit, reach 10 ft., one creature. Hit: 12 (2d8 + 3) bludgeoning damage, and the target must make a DC 15 Constitution saving throw, taking 10 (3d6) poison damage on a failed save, or half as much damage on a successful one.

Fake Feast. The swamp lily magically creates the image of a banquet within 5 feet of itself that compels creatures to eat from it. Each creature within 60 feet of the banquet that can see the banquet must succeed on a DC 15 Wisdom saving throw or be charmed by the lily. The lily must take a bonus action on its subsequent turns to maintain the illusion. The illusion ends if the lily is incapacitated. While charmed by the lily, a target is incapacitated and ignores the banquets of other lilies. If the charmed target is more than 5 feet away from the lily's banquet, the target must move on its turn toward the banquet by the most direct route, trying to get within 5 feet. It doesn't avoid opportunity attacks, but before moving into damaging terrain, such as lava or a pit, and whenever it takes damage from a source other than the lily, the target can repeat the saving throw. A charmed target can also repeat the saving throw at the end of each of its turns. If the saving throw is successful, the effect ends on it. A target that successfully saves is immune to this swamp lily's Fake Feast for the next 24 hours. If the charmed target starts its turn within 5 feet of the banquet, it eats the feast and must make a DC 15 Constitution saving throw. On a failure, the creature takes 21 (6d6) poison damage and is poisoned for 1 minute. On a success, the creature takes half the damage and isn't poisoned.