From Pathfinder Society Scenario #2-16: Freedom for Wishes, which isn't enabled.

Wishbound Mist Stalker (7-8)

CREATURE 5

UNCOMMON MEDIUM AMPHIBIOUS ELEMENTAL EVIL WATER

Perception +14; darkvision; mist vision

Languages Thalassic

Skills Athletics +12, Stealth +14

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

AC 22; Fort +12, Ref +14, Will +13

HP 73; Immunities bleed, paralyzed, poison, sleep

Mist Cloud (aura, primal, water)

15 feet. The mist stalker is surrounded by mist. Creatures in the aura are Concealed. If wind disperses the aura, it returns automatically at the start of the mist stalker's turn. This cloud is suppressed in water.

Mist Vision

The mist stalker ignores the Concealed condition from mist and fog.

Speed 20 feet, climb 20 feet, swim 30 feet

Melee Tentacle +15 (finesse, reach 10, sweep, unarmed), Damage 2d8+6 bludgeoning plus Grab

Constrict

1d8+6 bludgeoning damage DC 21 basic Fortitude, Escape

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.

Solidify Mist (primal, water)

The mist stalker makes its mist cloud congeal, causing the aura to be difficult terrain until the start of the mist stalker's next turn. In addition, the mist stalker can make the mist even thicker around a single Medium or smaller creature within the cloud. The creature must succeed at a DC 21 Reflex save or become Immobilized until it Escapes or it is no longer in the mist cloud's emanation.

Grab

Requirements The monster's last action was a successful Strike that lists 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. This attempt neither applies nor counts toward the creature's multiple attack penalty.

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

Pathfinder Society Scenario #2-16: Freedom for WishesOGL