Bloombeast

Symbiotic Regrowth.
At the start of its turn, the Bloombeast regains 1d10 hit points unless it has taken radiant or necrotic damage since its last turn.

Psychic Bloom Howl (2 charges).
The Bloombeast emits a psychic scream. Each creature within 30 feet that can hear it must make a DC 15 Wisdom saving throw or be stunned until the end of their next turn. On a success, the creature is immune to this effect for 24 hours.

Rooted Terrain.
The ground in a 10-foot radius around the Bloombeast is difficult terrain. Any creature that starts its turn there must succeed on a DC 14 Strength saving throw or have their speed reduced to 0 until the start of their next turn.

Death Effect – Final Bloom
When slain, the Bloombeast explodes into a radial bloom, launching seeds and releasing a powerful psychic scream from all absorbed minds. The terrain in a 30 ft. radius becomes hazardous bloom-terrain — with carnivorous roots and memory-thirsting flora for 24 hours.

Multiattack.
The Bloombeast makes two Vine Lash attacks.

Vine Lash.
Melee Weapon Attack: +8 to hit, reach 15 ft., one target.
Hit: 15 (2d10 + 4) bludgeoning damage.
The target must succeed on a DC 16 Constitution saving throw or be grappled and suffer disadvantage on Wisdom saving throws until the grapple ends.

Bite: Melee Weapon Attack: +9 to hit, reach 10 ft., one target.
Hit: 21 (3d10 + 5) piercing damage.

Bloom Spike
Melee or Ranged Weapon Attack: +8 to hit, reach 10 ft. or range 30 ft., one target
Hit: 13 (3d6 + 3) piercing damage + 7 (2d6) psychic damage
Effect: A shard of crystallized plant matter launches from the Bloombeast and buries itself in the target’s skin. The spike pulses with memory-bloom spores.
The target must succeed on a DC 15 Wisdom saving throw or see visions of a past trauma, suffering disadvantage on their next attack roll or ability check.
If the spike is not removed (DC 13 Medicine check, 1 action), the psychic damage repeats at the start of the target’s next turn.

Pollen Cloud (3 charges).
The Bloombeast releases a 20-ft-radius cloud of psychic spores. Each creature in the area must make a DC 15 Constitution saving throw or become confused (as per the confusion spell) for 1 minute. Targets can repeat the saving throw at the end of each of their turns.