Velstrac

Velstracs are lawful evil outsiders native to the Shadow Plane who feed on fear and pain.
Traits: Darkvision 60 ft., immunity to cold, Regeneration | Ex 5 (suppressed by good or silver), unnerving gaze (see below).

Unnerving Gaze (Su): This gaze ability manipulates the perceptions of those who look upon a velstrac. Unnerving gaze has a range of 30 feet and can be negated by a Will save; the exact effects vary by velstrac. All velstracs are immune to this ability. This is a mind-affecting fear effect.