n medium shadow 

Perception +10; darkvision

Languages Aklo, Auran, Common, Riakreir, Undercommon

Skills Acrobatics +13, Deception +9, Occultism +11, Shadow Plane Lore +11, Stealth +13

Str +3 Dex +5 Con +1 Int +3 Wis +2 Cha +3

Items dagger (5)

Shadow Shift Being made partially of shadow themselves, riakreir are concealed in dim light or darkness even to creatures that can see clearly in those light levels.

AC  21; Fort +9, Ref +11, Will +10

HP 45; Immunities precision; Resistances cold 5, negative 5

Counterattack [R] Trigger The riakreir is targeted by an attack from an adjacent creature that misses due to the riakreir being concealed; Requirements The riakreir is aware of the attack; Effect The riakreir makes a Strike against the attacker.

Slip [R] Trigger A creature moves adjacent to the riakreir; Effect The riakreir teleports to a clear space adjacent to another creature they can see within 30 feet.

Speed 25 feet, fly 35 feet; swift steps, tenebral form

Melee [>] dagger +13 (agile, finesse, versatile s), Damage 1d4+5 piercing and 1d6 cold

Ranged [>] dagger +13 (agile, thrown 10 feet, versatile s), Damage 1d4+5 piercing and 1d6 cold

Occult Innate Spells DC 21; 7th plane shift (self only, to Shadow Plane or Material Plane only); 4th gaseous form (at will); Cantrips (2nd) chill touch, detect magic

Bide [>>] The riakreir prepares to take action against their foes, watching their opponent and waiting for the right opportunity to respond. The riakreir gains a second reaction until the start of their next turn, though they still can't use more than one reaction on the same triggering action.

Swift Steps The riakreir's movement doesn't trigger reactions.

Tenebral Form The riakreir can Fly at full Speed in gaseous form.

Bestiary 3, page 230.