"For gliding!" Erin answers cheerfully. "They're magic, I'm magic, and it affects me in ways not immediately obvious to medical testing. The quick cliff notes: I need about double the calories you might expect, and about three times the sugar. I'm not gonna scar no matter what you do to me so don't fret about that..." She trails off in thought, then perks up again: "And my blood type is O+ but don't give it to hemovores, they'll trip balls."