@Abandoned child they're the wyverns of this novel's world building.
Her brother brought black eggs from an old woman and they hatched into black chicks with different eye colors. If I remember correctly, it's 5 wyverns, and they have different eye colors.
Each eye color represents a magic element, because her brother was the one to nurture magic into them.
Now because of the dangerous miasma they evolved from their chick shape to their adult shape (or at least teen).
That's what I remember from the plot.
Her brother brought black eggs from an old woman and they hatched into black chicks with different eye colors. If I remember correctly, it's 5 wyverns, and they have different eye colors.
Each eye color represents a magic element, because her brother was the one to nurture magic into them.
Now because of the dangerous miasma they evolved from their chick shape to their adult shape (or at least teen).
That's what I remember from the plot.