uncommon ne medium aberration 

Perception +11; darkvision, poison sense (precise) [object Object] feet

Languages Abyssal, Common, Infernal, Undercommon

Skills Acrobatics +10, Crafting +12, Nature +8, Religion +10, Stealth +12

Str +3 Dex +4 Con +3 Int -1 Wis +2 Cha +0

Poison Sense A fefaliath senses any poisoned creature. It can spend an action with the concentrate trait to determine the poison's type and current stage.

AC  21; Fort +12, Ref +12, Will +8

HP 60; Immunities poison; Weaknesses good 5

Speed 40 feet, climb 30 feet

Melee [>] bite +12, Damage 2d6+4 piercing plus fefaliath venom

Occult Innate Spells DC 21; 2nd death knell, invisibility (at will), vomit swarm; Constant (2nd) negate aroma

Change Shape (arcane, concentrate, polymorph, transmutation) A fefaliath can take the shape of a Tiny spider. This doesn't change its Speed or Strikes.

Fefaliath Venom (poison, virulent) Saving Throw DC 19 Fortitude; Maximum Duration 6 rounds; Stage 1 1d6 poison (1 round); Stage 2 1d6 poison and enfeebled 1 (1 round); Stage 3 2d6 poison, clumsy 1, and enfeebled 1 (1 round)

Strength of Thousands #3: Hurricane’s Howl, page 81.