While the vesiculosa remains motionless, it is indistinguishable from a normal pool of water.

A vesiculosa’s heartvine resembles a lump of sapphire and is highly prized by alchemists (worth 1,000 gp). It can be reached with an hour or two of hard digging.

The vesiculosa is surrounded at all times by four Medium swarms of Tiny rootlets that move as the vesiculosa directs. Each swarm has a speed of 30 feet, can be targeted independently, has 25 hit points, and (unlike the parent plant) quite vulnerable to fire damage. Other than that, they have the same statistics as the vesiculosa’s main body. For each swarm that drops to 0 hit points, the vesiculosa loses one of its Entrap attacks. A destroyed swarm regrows in 24 hours.

The vesiculosa’s pool emits a sweet fragrance that lures creatures to drink. Creatures that are neither undead nor constructs within 60 feet must succeed on a DC 16 Wisdom saving throw or be compelled to approach the vesiculosa and drink. The water is cool and refreshing but carries a sleeping poison: any creature (other than undead and constructs) that drinks from it regains 1d4 hp and recovers from 1 level of exhaustion, but must succeed on a DC 15 Constitution saving throw against poison or fall unconscious for 1 minute. If the saving throw fails by 5 or more, the creature is unconscious for 1 hour. An unconscious creature wakes up if it takes damage or if another creature uses an action to shake it awake.

The vesiculosa’s sap seeps into the soil, promoting lush vegetation. At any given time, 3d6 beneficial fruits (fruit, nuts, figs, dates) can be found within 30 feet of the vesiculosa. These have the same effect as berries from a goodberry spell, but they retain their potency for one week after being picked or after the vesiculosa is killed.