Blood blackend and trembling this lean man-shaped beast walks toward ye. It has neither mouth nor eyes, just dagger-long claws on the ends of it's too long arms. Dark foot prints chase behind it's dripping mass.

Hailing from the pits of Nothingness between the planes this unique fiend is instinct incarnate - never wavering, never changing. It has been found in the shadows of dried up wells and between the dripping stalactites of ancient cave-cities, in the corners of rooms where walls come to together, and in the blackness between the stars. It is more likely a person will find themselves in the Stillness, than a Stillness attacking - either way it engulfs them, slowly choking and tearing. ,Hailing from the pits of Nothingness between the planes this unique fiend is instinct incarnate - never wavering, never changing. It has been found in the shadows of dried up wells and between the dripping stalactites of ancient cave-cities, in the corners of rooms where walls come to together, and in the blackness between the stars. It is more likely a person will find themselves in the Stillness, than a Stillness attacking - either way it engulfs them, slowly choking and tearing.

Combat

Frightful Presence (Ex): This special quality makes a creature’s very presence unsettling to foes. It takes effect automatically when the creature performs some sort of dramatic action (such as charging, attacking, or snarling). Opponents within range who witness the action may become frightened or shaken. Actions required to trigger the ability are given in the creature’s descriptive text. The range is usually 30 feet, and the duration is usually 5d6 rounds. This ability affects only opponents with fewer Hit Dice or levels than the creature has. An affected opponent can resist the effects with a successful Will save (DC 10 + 1/2 frightful creature’s racial HD + frightful creature’s Cha modifier; the exact DC is given in the creature’s descriptive text). An opponent that succeeds on the saving throw is immune to that same creature’s frightful presence for 24 hours. Frightful presence is a mind-affecting fear effect.
Paralysis (Ex): This special attack renders the victim immobile. Paralyzed creatures cannot move, speak, or take any physical actions. The creature is rooted to the spot, frozen and helpless. Paralysis works on the body, and a character can usually resist it with a Fortitude saving throw (the DC is given in the creature’s description). Unlike hold person and similar effects, a paralysis effect does not allow a new save each round. A winged creature flying in the air at the time that it is paralyzed cannot flap its wings and falls. A swimmer can’t swim and may drown.
Poison (Ex): Poison attacks deal initial damage, such as ability damage (see page 305) or some other effect, to the opponent on a failed Fortitude save. Unless otherwise noted, another saving throw is required 1 minute later (regardless of the first save’s result) to avoid secondary damage. A creature’s descriptive text provides the details.A creature with a poison attack is immune to its own poison and the poison of others of its kind.The Fortitude save DC against a poison attack is equal to 10 + 1/2 poisoning creature’s racial HD + poisoning creature’s Con modifier (the exact DC is given in the creature’s descriptive text).A successful save avoids (negates) the damage.
Blindsense (Ex): Using nonvisual senses, such as acute smell or hearing, a creature with blindsense notices things it cannot see. The creature usually does not need to make Spot or Listen checks to pinpoint the location of a creature within range of its blindsense ability, provided that it has line of effect to that creature. Any opponent the creature cannot see still has total concealment against the creature with blindsense, and the creature still has the normal miss chance when attacking foes that have concealment. Visibility still affects the movement of a creature with blindsense. A creature with blindsense is still denied its Dexterity bonus to Armor Class against attacks from creatures it cannot see.
Change Shape (Su): A creature with this special quality has the ability to assume the appearance of a specific creature or type of creature (usually a humanoid), but retains most of its own physical qualities. A creature cannot change shape to a form more than one size category smaller or larger than its original form. Changing shape results in the following changes to the creature: