From Pathfinder Rage of Elements, which isn't enabled.

Whipping Willow

CREATURE 4

These tall, thin figures are too treelike to be dryads, yet too humanoid to be arboreals. Their blank faces and thin trunks bear only the slightest suggestion of humanoid features. Rather than hands, their long, branchlike arms eventually split into equally proportioned branchlike digits, which the willows use both to fight and swing through their native plane.

Perception +11

Languages Arboreal, Muan

Skills Athletics +12 (+15 to Trip or Grapple)

Str +2, Dex +5, Con +2, Int +0, Wis +1, Cha +2

Grounded

When saving against an effect attempting to knock them Prone, a whipping willow achieves one degree of success better than what they rolled. Additionally, the willow doesn't fall prone on a critical failure to Trip an opponent.

AC 20; Fort +10, Ref +8, Will +14

HP 75; Immunities bleed, paralyzed, poison, sleep; Weaknesses fire 5, axe vulnerability 5

Speed 30 feet, climb 40 feet

Melee Whip +11 (finesse, reach 15, trip), Damage 2d8+5 bludgeoning plus Strangling Vines

Constrict

2d4+5 bludgeoning, DC 21 basic Fortitude

The monster deals the listed amount of damage to any number of creatures Grabbed or Restrained by it. Each of those creatures can attempt a basic Fortitude save with the listed DC.

Strangling Vines

When a whipping willow hits a creature with their whip Strike, they can choose to Grab and begin strangling the creature. The target is suffocating and can't speak as long as it's strangled.

Unseating Sweep

The whipping willow attempts to Trip all creatures within a 15-foot cone, making a single Athletics check against all targets' Reflex DCs.

Pathfinder Rage of ElementsOGL