Wind by Naomi kritzer(10)

“Would you undo this trade, if you could?”
“If I could go back…” Dagmar pushed her hair out of her face, thinking about it. “I’d be a fool not to. She has a piece of my soul inside her, and I have a piece of hers—I’d never have agreed if I’d known that she would leave me. I like having the healing gift, though. I’d hate to give it up. I don’t know how the people born this way ever manage to go get proper training.”
“When someone is born with an excess of an element,” Zimeya said, “that usually means that they have too much of one thing, but they still have a normal allotment of the others. You gave away all your Air, just as your friend must have given away all her Earth. It left you each with a towering power and an equally great deficiency.”