Esoteric Harmonization
Esoteric Harmonization is a magical concept that some species will have the ability to innately cast, or have an easier time learning, certain spells. Many planetouched have esoteric harmonization, usually related to magic associated with their ancestors. Examples of species with esoteric harmonization include tieflings, Aasimar, Genasi, Firbolgs, Tritons, and Yuan-ti.