ce medium aberration 

Perception +10; darkvision

Languages Lomos, Aquan, Common; tongues

Skills Acrobatics +12, Athletics +12, Deception +13, Stealth +13, Thievery +9

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

Items longsword, studded leather

AC  21; Fort +9, Ref +9, Will +12

HP 60

Speed 25 feet

Melee [>] longsword +14 (versatile p), Damage 1d8+6 slashing

Melee [>] claw +12 (agile), Damage 2d6+6 slashing plus Grab

Occult Innate Spells DC 19; Constant (5th) tongues

Assume Form (concentrate, occult, polymorph, transmutation) The faceless stalker spends 10 minutes reshaping its appearance to take on the shape of any Small or Medium humanoid. It gains a +4 circumstance bonus to Deception checks to pass as that creature.

Blood Nourishment [>] The faceless stalker uses its three-pronged tongue to drink the blood of an adjacent restrained or unconscious creature. The creature gains drained 1.

Compression When the faceless stalker successfully Squeezes, it moves through the tight space at full speed. Narrow confines are not difficult terrain for a faceless stalker.

Revert Form [F] Requirements The faceless stalker is in an assumed form. Effect The faceless stalker resumes its true form. Until the start of its next turn, it gains a +2 status bonus to attack rolls, damage rolls, saving throws, and skill checks.

Sneak Attack The faceless stalker deals 1d6 extra precision damage to flat-footed creatures.

Bestiary, page 13.