Final answer:
Darrow eats the card to symbolize rebirth during the initiation test for Ares.
Step-by-step explanation:
Darrow eats the card he pulls from Dancer's bowl during the initiation test for Ares to symbolize rebirth.
By consuming the card, Darrow is metaphorically shedding his old identity and embracing a new one as he joins the Ares faction.
This act of eating the card represents a transformative process, similar to the concept of rebirth.