Eating your element is a standard part of Slayer type magic. A fire Slayer can eat fire, an iron Slayer can eat iron, etcetera. Since I use Sky Dragon Slaying magic, I can eat anything that's part of the sky.

I used to not be very good in a fight too. All I could offer was a barely effective breath attack. My friends helped me change that, and I'd be glad to do the same for you, Twilight.