From Pathfinder Rage of Elements, which isn't enabled.

Abysium Horror

CREATURE 10

A monstrous spider-like creature composed of the radioactive skymetal abysium, this deadly predator contaminates anything it touches.

Perception +17; darkvision

Languages Talican

Skills Athletics +23, Survival +19

Str +7, Dex +3, Con +5, Int +3, Wis +3, Cha +3

AC 29; Fort +21, Ref +19, Will +17

HP 215; Immunities bleed, paralyzed, poison, sleep; Resistances electricity 10

Green Glow (aura, poison, radiation)

20 feet.

An abysium horror constantly emanates a powerful energy toxic to life. This radiation sheds dim light in the area. Any creature beginning its turn in the aura must attempt a DC 27 Fortitude save, becoming Sickened 1 on a failure or Sickened 2 on a critical failure. Once out of the aura, an affected creature's sickened condition automatically decreases by 1 at the beginning of each of its turns.

Heavy

As long as it is immobile, the elemental can't be forcibly moved or knocked Prone. If it takes a move action, it loses this immunity until the start of its next turn.

Speed 30 feet, climb 20 feet

Melee Claw +23 (reach 15, unarmed), Damage 2d4 poison plus 2d8+10 slashing

Ranged Radioactive Shrapnel +23 (brutal, propulsive, range increment 60 feet), Damage 2d4 poison plus 2d8+7 piercing

Trample

Large or smaller, claw, DC 27 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).

Pathfinder Rage of ElementsOGL