uncommon ce huge dragon plant 

Perception +25; darkvision, scent (imprecise) 60 feet

Languages Common, Draconic, Sylvan

Skills Acrobatics +21, Athletics +27, Deception +24, Intimidation +26, Nature +25, Stealth +21 (+25 in forests), Survival +23

Str +7 Dex +3 Con +4 Int +3 Wis +5 Cha +4

AC  36; Fort +25, Ref +22, Will +27

HP 290; Immunities poison, paralyzed, sleep; Weaknesses fire 10

Frightful Presence (aura, emotion, fear, mental) 90 feet, DC 32. Animals, fungi, and plants take a –2 circumstance penalty to the save.

Fed by Water [R] (healing, necromancy, primal) Frequency once per hour; Trigger The forest dragon is targeted with a water spell or effect; Effect The forest dragon gains 35 temporary Hit Points.

Speed 40 feet, fly 120 feet; woodland stride

Melee [>] jaws +29 (magical, reach 15 feet), Damage 3d10+13 piercing plus 2d6 poison

Melee [>] claw +29 (agile, magical, reach 10 feet), Damage 3d8+13 slashing plus Grab

Melee [>] tail +29 (magical, reach 25 feet), Damage 3d8+13 bludgeoning plus Grab

Primal Innate Spells DC 34; 4th entangle, tree shape; Cantrips (4th) know direction; Constant (1st) pass without trace (forest terrain only)

Breath Weapon [>>] (evocation, primal) The dragon unleashes a swarm of insects that deals 14d6 piercing damage in a 40-foot cone (DC 34 basic Reflex save) before dispersing. A creature that critically fails is stunned 2 from the insects' venom; this is a poison effect. The dragon can't use Breath Weapon again for 1d4 rounds.

Coiling Frenzy [>>] The dragon makes one claw Strike and one tail Strike in either order, each against the same target. If either Strike hits, the dragon automatically Grabs the target.

Draconic Momentum The dragon recharges their Breath Weapon whenever they score a critical hit with a Strike.

Draining Blight [>>] (healing, necromancy, negative, primal) Frequency once per day; Effect The dragon draws moisture from the living creatures surrounding them, using the energy to heal their own wounds. Each living creature in a 30-foot emanation takes 7d10 negative damage (DC 34 basic Fortitude save). Creatures made entirely of water and plant creatures use the outcome one degree of success worse than they rolled. The dragon regains Hit Points equal to half of the highest damage a single creature takes from this effect. In addition, all non-creature plant life in the area withers and dies, eliminating non-magical undergrowth and any resulting difficult terrain, cover, and concealment. Water is also consumed in the same way, typically lowering any standing body of water fully within the area by 1 foot.

Forest Shape When casting tree shape, a forest dragon can become a tree of the same size and age as themself.

Greater Constrict [>] 3d8+10 bludgeoning, DC 34 (page 305)

Woodland Stride The forest dragon ignores difficult terrain and greater difficult terrain from non-magical foliage.

Bestiary 3, page 75.