From Pathfinder Bestiary 2, which isn't enabled.

Titan Centipede

CREATURE 9

GARGANTUAN ANIMAL

These colossal, solitary centipedes claim vast hunting grounds.

Perception +18; darkvision

Skills Acrobatics +16, Athletics +21

Str +8, Dex +1, Con +5, Int -5, Wis +5, Cha -4

AC 28; Fort +20, Ref +16, Will +18

HP 155

Speed 50 feet, climb 50 feet

Melee Mandibles +21 (reach 20, unarmed), Damage 2d10+12 piercing plus Titan Centipede Venom

Melee Foot +19 (unarmed), Damage 2d8+10 bludgeoning

Impaling Critical

When a titan centipede scores a critical hit with its mandibles, the target is painfully pierced with barbed spines and bristles, taking 1d6 persistent bleed damage and becoming Off-Guard as long as the bleed damage continues.

Titan Centipede Venom (poison)

Saving Throw DC 28 Fortitude

Maximum Duration 6 rounds

Stage 1 2d6 poison damage and Clumsy 2 (1 round)

Stage 2 2d8 poison damage, clumsy 2, and Slowed 1 (1 round)

Stage 3 2d10 poison damage, clumsy 2, and Slowed 2 (1 round)

Trample

Huge or smaller, foot, DC 28 basic Reflex

The monster Strides up to double its Speed and can move through the spaces of creatures of the listed size, Trampling each creature whose space it enters. The monster can attempt to Trample the same creature only once in a single use of Trample. The monster deals the damage of the listed Strike, but trampled creatures can attempt a basic Reflex save at the listed DC (no damage on a critical success, half damage on a success, double damage on a critical failure).

Undulate

The titan centipede Strides up to its Speed or Steps. During this movement, it can pass through spaces as narrow as 10 feet without Squeezing.

Pathfinder Bestiary 2OGL