From Pathfinder #168: King of the Mountain, which isn't enabled.

Sthira

CREATURE 20

The Wall of Heaven claims many intrepid climbers. Some such travelers come seeking fortune. Others seek enlightenment. Many, however, find only an icy death. With no means for a proper burial, many of these unfortunate souls remain abandoned to the ice, their bodies becoming macabre guideposts along mountain trails.

Through means unknown, the most willful of these frozen travelers reanimate to seek vengeance upon the living for their denied burial. Such creatures, called sthiras, are composed of multiple bodies or body parts frozen together into one horrific monstrosity.

Perception +33; darkvision

Languages Common; (can't speak any language)

Skills Athletics +39

Str +9, Dex +2, Con +10, Int -5, Wis +0, Cha -2

Items Greatsword

Create Sthira (primal)

When a creature dies while it has persistent cold damage from the sthira's frostbite, the creature rises as a sthira in 24 hours. If the creature is grabbed by the sthira when it dies, the dying creature becomes permanently fused with the sthira instead. In this case, the sthira immediately recovers a number of Hit Points equal to the half the dead creature's maximum Hit Points.

AC 45; Fort +39, Ref +27, Will +33

HP 475, void healing; Immunities bleed, cold, death effects, disease, mental, paralyzed, poison, unconscious; Weaknesses fire 20

Attack of Opportunity

Trigger A creature within the monster's reach uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action it's using.

Effect The monster attempts a melee Strike against the triggering creature. If the attack is a critical hit and the trigger was a manipulate action, the monster disrupts that action. This Strike doesn't count toward the monster's multiple attack penalty, and its multiple attack penalty doesn't apply to this Strike.

Frozen to the Touch (cold)

A creature that damages the sthira with an unarmed attack, tries to Grapple it, or otherwise touches it takes 6d6 cold damage (DC 42 basic Fortitude save).

Void Healing

A creature with void healing draws health from void energy rather than vitality energy. It is damaged by vitality damage and is not healed by vitality healing effects. It does not take void damage, and it is healed by void effects that heal undead.

Speed 25 feet

Melee Greatsword +38 (magical, reach 10, versatile p), Damage 3d12+15 slashing plus 2d6 cold plus Frostbite

Melee Fist +38 (magical, reach 10, unarmed), Damage 3d8+15 bludgeoning plus 2d6 cold plus Frostbite plus Improved Grab

Innate Primal Spells DC 39, attack +31; 10th Massacre; 9th Polar Ray (×2), Storm of Vengeance (hail only each round), Wall of Ice; Cantrips (10th) Ray of Frost

Freezing Death (aura, cold, primal)

20 feet. A creature that starts its turn in the aura takes 6d6 cold damage (DC 42 basic Fortitude save). If the creature is grabbed or restrained by the sthira, it takes one degree of success worse than it rolled.

Frostbite

A creature that takes cold damage from a sthira's Strikes or aura must attempt a DC 42 Fortitude save. A creature that already has persistent cold damage from frostbite ignores this effect.

Critical Success The creature is unaffected, and is temporarily immune to this ability for 1 hour.

Success The creature is unaffected.

Failure The creature takes 3d6 persistent cold damage.

Critical Failure As failure, but the creature is also Drained 1.

Improved Grab

Trigger The monster's last action was a successful Strike that lists Improved Grab in its damage entry, or the monster has a creature Grabbed or Restrained

Effect If used after a Strike, the monster attempts to Grapple the creature using the body part it attacked with as a free action. This attempt neither applies nor counts toward the creature's multiple attack penalty.

The monster can instead use Improved Grab as an action and choose one creature it's grabbing or restraining with an appendage that has Improved Grab to automatically extend that condition to the end of the monster's next turn.

Pathfinder #168: King of the MountainOGL