Pseudodemon — Radiance

You can manifest a halo (either the ring or disc version; your choice) of power about your head which sheds a pale but terrible light of whatever colour you wish. Treat this as a Light spell, or a Daylight spell at 5th level.

The light also terrifies most animals, though sufficiently aggravated animals or starving predators might ignore it. Even for higher mortals it is unnerving, and you gain a +1 racial bonus to intimidation against them.

The Radiance also reveals the hidden. Allied creatures excluding you gain a +2 circumstance bonus to Sense Motive checks and to saving throws against Illusion spells within the range of your Radiance.

At 9th level, a Pseudodemon of Below can instead shed Blacklight, acting as a constant Deeper Darkness, while a Pseudodemon of Above instead sheds the Light of Heaven, which counts as actual sunlight and negates hostile illusions (of a CL no higher than HD +4).

The halo can also be controlled to some extent with practice, for fancy light tricks; I’ll leave it up to you whether your character spent their time turning their halo into a rave strobe light.