Vantaraptors

[Prompt: An animal found in a non-populated area]
In the later millennia of Olua's life, when magic grows tired and seeks to gather every being to its deathbed, there is a place where creatures still rage against that depressive dimming. Perhaps the most charismatic of these creatures are vantaraptors, avian thermotrophs who rule lands of perpetual twilight.
Vantaraptors are the closest thing to an apex predator in the Dying Lands. They are clay-bound [bird descendants, for lack of a better term] which average slightly shorter and slightly larger than an ostrich. Truly raptorous in appearance, these entropic avifauna have returned to their saurian roots. As their name suggests, they are pure black, all but the rarest possessing magically-enhanced melanism. But for the shine in their eyes on a brighter day, they look like pure void. Though vantaraptors use their coloring as camouflage while they hunt, this doesn't appear to be the primary pressure for the evolution of such dark feathers. In fact, there isn't enough animal life out there to sustain a stable population of level three predators, so the vantaraptors had to evolve another means of supporting themselves. It appears this support comes in the form of energy -- starlight, Olua-heat, and pure magic. Because there is so little of it, and dwindling, vantaraptors have gradually gotten darker and darker, to capture as much energy as possible.
In terms of meat, vantaraptors will eat whatever they can find. Bugs, people, fog-dwelling mega-tardigrades -- they aren't picky. There's far too little around to be picky. And, except on the most bounteous days, the raptors need to supplement their diet with other energy. In summer, they can unfurl their spine-fans and soak up those good, good photons. During the seasons when there isn't a star encasing the whole planet, vantaraptors get more... creative. Taking a feather from their macaw cousins' books, raptors scrape clay from the ground and eat it. Sample analysis has shown that this clay has a much higher concentration of magicules than any other inorganic material in the area, and that that concentration is dramatically reduced in vantaraptor stool samples. Safe to say, they are extracting pure magic from the clay and converting it into energy.
It is theorized Oluan clay's magical density is a byproduct of her pseudobiological processes. Will the magic remain when she dies? Will the clay continue to "conveyor belt" its way through her faults? Or will this energy source dry up? Whatever the case, chances are slim the vantaraptor species will survive long past the death of their planet.