Bulbous Hydra

False Appearance: While motionless the Bulbous Hydra is undistinguishable from a mundane large plant.

Sweet Scent: All creatures within 15ft of the Bulbous Hydra that attempt to target the Bulbous Hydra with a hostile effect must succeed in a DC 16 Wisdom saving throw, a creature that failed this saving throw has disadvantage on attack rolls made against the Bulbous Hydra for the next minute.
This effect ends if the Bulbous Hydra attacks the affected creature, the creature becomes immune to this effect for the next 24 hours.

Multiheaded: The Bulbous Hydra has four heads. While it has more than one head, the hydra has advantage on saving throws against being blinded, charmed, deafened, frigthened, stunned and being knocked unconscious.

Whenever the hydra takes 25 or more damage in a single turn, one of its heads dies. If all its heads die, the Bulbous Hydra dies.

At the end of its turn, and if under sunlight it grows two heads for each of its heads that died since its last turn, unless it has taken fire or acid damage since its last turn. The hydra regains 10 hit points for each head regrown in this way.

Reactive Heads: For each head the Bulbous Hydra has beyond one, it gets an extra reaction that can be used only for opportunity attacks.

Photosinthesis: While under sunlight or the light the Bulbous Hydra regains 15 hit points, this does not happen if the Bulbous Hydra has taken fire or acid damage last turn.

Ambush: The Bulbous Hydra can make two Petal Bite attacks first regardless of the initiative order, it then must follow its initiative order as normal.

Multiattack: The Bulbous Hydra makes as much Petal Bite attacks as the number of heads it currently has, and one additional Thorn Claw on its attack action

Petal Bites: Melee Weapon Attack +8 to hit, 15ft reach, one target, for 3d6+5 bludgeoning damage.  

A creature hit by this attack must succeed in a DC 16 Strength or Dexterity saving throw being grappled by the Bulbous Hydra on a failure.
A creature grappled in this way is restrained.
A creature restrained in this way takes 1d8 acid damage at the end of the Bulbous Hydra´s turn.
A creature restrained in this way may attempt to break free on its action by succeeding in a DC 16 Strength saving throw breaking free on a success.

Thorn Claw: Melee Weapon Attack +8 to hit, 5ft reach, one target, for 3d4+5 piercing damage.
A creature hit by this attack must succeed in a DC 16 Constitution saving throw taking 1d8 poison damage and being poisoned until the end of their next turn on a failure.