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From Pathfinder Lost Omens Cheliax, Infernal Inheritance, which isn't enabled.

Bright Fetchling

HERITAGE
Ancestry Fetchling

Your body proves that shadow can't exist without light. Perhaps your eyes glow brighter or your veins occasionally pulse with light. You emit dim light within 5 feet of you. You can activate or suppress this ability with a Sustain action. Additionally, you can force fragments of your shadow to glow and even partially solidify, allowing you to cast Light and Shield as occult innate cantrips. Cantrips are heightened to a spell rank equal to half your level rounded up.

Pathfinder Lost Omens Cheliax, Infernal InheritanceORC