(Avarice) Devouring Phantom Dragon

Lore
When the dragon eats enough, it changes into a special form. With its multiple legs, it can even chase after hard to reach prey. With its long tail, it can capture anything that tries to run. Now that it's achieved its true form, one would think that it would be satisfied. However, now that its stomach has grown to match its gigantic body, it finds it's even hungrier that before