uncommon n huge amphibious beast cold 

Perception +25; darkvision, tremorsense (imprecise) 80 feet

Languages Aklo

Skills Athletics +31, Stealth +24

Str +8 Dex +3 Con +7 Int -3 Wis +2 Cha +3

AC  39; Fort +28, Ref +26, Will +23

HP 320; Immunities cold; Weaknesses fire 15

Speed 50 feet, burrow 25 feet, swim 40 feet

Melee [>] jaws +31 (reach 10 feet), Damage 3d6+16 piercing plus 3d6 cold

Melee [>] pincers +31 (agile, reach 15 feet), Damage 3d8+16 slashing plus Improved Grab

Freezing Breath [>>] (cold, evocation, incapacitation, primal) The umonlee breathes a cone of extremely cold air that damages its prey and can freeze them to the ground. Its breath deals 12d8 cold damage to creatures in the 50-foot cone (DC 38 Reflex save). The umonlee can't use Freezing Breath again for 1d4 rounds. Critical Success The creature is unaffected.Success The creature takes half damage and is slowed 1 for 1 round.Failure The creature takes full damage and is slowed 1 for 1 round. If the creature is standing on the ground, it's immobilized as thick ice forms around it, and it can't recover from being slowed. The creature remains immobilized and slowed 1 until it manages to Escape (DC 36) or deal 30 damage to the ice, which has weakness 10 to fire.Critical Failure As failure, except the creature takes double damage and the ice holding it in place requires 60 damage to break.

Greater Constrict [>] 2d10+8 bludgeoning, DC 36

Bestiary 2, page 271.