unique n large construct 

Perception +7; darkvision

Languages Common (Can't Speak); empathy link

Skills Athletics +12, Intimidation +7

Str +5 Dex +1 Con +4 Int +0 Wis +0 Cha -2

Empathy Link (arcane, divination, mental) The behemoth can't speak, but its mind is linked to its creator. It can share basic emotional information with its creator, such as fear, happiness, or anger. If the behemoth is destroyed, its master automatically knows this. The range of this link is 1,500 feet.

AC  17; Fort +11, Ref +6, Will +7

HP 60; Immunities bleed, death effects, disease

Speed 20 feet

Melee [>] fist +12 (reach 10 feet), Damage 2d6+5 bludgeoning

Attack of Opportunity [R]

Massive Strike [>>] The behemoth makes a melee Strike and, if the attack hits, it can push the creature back 10 feet (20 feet on a critical hit). The target must succeed at a DC 19 Fortitude save or be knocked prone by this attack.

Stomp [>>] The behemoth can stomp on the ground, causing all creatures within 10 feet to fall prone (DC 19 Reflex save negates).

The Fall of Plaguestone, page 47.