n gargantuan construct mindless 

Perception +21; darkvision

Skills Athletics +30

Str +9 Dex +2 Con +8 Int -5 Wis +0 Cha -5

AC  36 (32 when broken); construct armor; Fort +29, Ref +19, Will +17

HP 200; Hardness 14; Immunities mental, poison, death effects, disease, doomed, drained, fatigued, healing, necromancy, nonlethal attacks, paralyzed, sickened, unconscious

Construct Armor Like normal objects, an animated trebuchet has Hardness. This Hardness reduces any damage the trebuchet takes by an amount equal to the Hardness. Once an animated trebuchet is reduced to fewer than half its Hit Points, or immediately upon being damaged by a critical hit, its construct armor breaks, removing the Hardness and reducing its Armor Class to 32.

Speed 20 feet

Melee [>] arm +28 (magical, reach 15 feet), Damage 3d12+11 bludgeoning plus Grab

Ranged [>] rock +28 (brutal, magical, range increment 120 feet), Damage 3d10+11 bludgeoning

Launch [>] Requirements The animated trebuchet has a creature grabbed in its arm; Effect The animated trebuchet attempts an Athletics check against the grabbed creature's Fortitude DC. On a success, it fires the creature up to 40 feet in height and up to 120 feet away. The creature takes 4d12 bludgeoning damage plus the appropriate falling damage. If the flung creature lands on another creature, the creature it lands on takes the same amount of bludgeoning damage (DC 33 basic Reflex save). On a successful Launch, the animated trebuchet must Interact to reposition its arm into the proper position before it can Launch again.

Trample [>>>] (attack) Large or smaller, arm, DC 33

Bestiary 3, page 19. Expanded in LOIL.