uncommon ne medium aberration 

Perception +11; darkvision

Languages Undercommon

Skills Acrobatics +11, Athletics +11, Stealth +13

Str +3 Dex +5 Con +3 Int -2 Wis +3 Cha +0

AC  21; Fort +11, Ref +13, Will +9

HP 60; Weaknesses fire 5; Resistances poison 5

Oily Scales A scalathrax constantly sweats a glistening oil that makes it exceptionally slick. It treats the results of Acrobatics checks to Squeeze or of any skill check to Escape as one degree of success greater than the rolled result. A scalathrax loses this benefit for 1 minute after it takes any amount of fire damage.

Speed 25 feet, climb 25 feet

Melee [>] jaws +13 (finesse), Damage 2d8+5 piercing plus scalathrax venom

Ranged [>] leg quill +13 (range increment 20 feet), Damage 2d4+5 piercing

Scalathrax Venom (poison) Saving Throw Fortitude DC 21

Maximum Duration 6 rounds; Stage 1 clumsy 1 (1 round); Stage 2 clumsy 1 and slowed 1 (1 round); Stage 3 clumsy 1 and slowed 2 (1 round)

Spray Toxic Oil [>>] (conjuration, primal) The scalathrax disgorges a gout of toxic oil from its mouth in a 15-foot cone. Creatures in the area must attempt a DC 21 Reflex save. The scalathrax can't use Toxic Oil Spray again for 1d4 rounds. Critical Success The creature is unaffected.Success The creature takes 1d8 poison damage.Failure The creature takes 2d8 poison damage. For 1 minute, the creature gains weakness to fire 5, and whenever the creature critically fails with an attack roll with a wielded weapon, it drops the weapon.Critical Failure As failure, but 4d8 poison damage.

AV1, page 86.