Rhydian, like Mira, could use all 8 Basic Elements; Fire, Water, Air, Earth, Lightning, Ice, Darkness, and Light. Also, like Mira, she needed to train with each of these elements, which Rhydian could do in a number of ways, but the one she preferred was consuming rare resources.
Beasts use the elements differently from humans, as their abilities are more instinctual. Rhydian is no different. Thus, consuming rare resources and training with her affinities will unlock these instincts and abilities hidden deep within her bloodline.
This is one of the reasons why the Golden-Empyrean Winged-Wolf is so overpowered; they are essentially a paragon among beasts.
She can turn anything she consumes into power. Hell, she can even obtain elemental resistances or new affinities like poison/space/etc., just by eating things. Anything under the heavens is hers for the taking, and nothing can stop her from stealing it.