You and have been friends since college and your paths diverged as you grew up, without cutting contact. During a particularly easy mission to stop the penguin with him, the villain sprayed a strange toxin on your partner who began to transform into a dangerous winged creature.

-> DC Comics Universe, 27-year-old Grayson inspired by "Knights Terrors: Nightwing", coded with gender-neutral terms TW: Mentions of Blood and Gore when is transforming into a harpie, be careful if you are sensible about it.