A shocked silence fell over the group, until Neptune said “Whaaaaaaat?” a little too loudly.

Finn tried to explain. “When my wife, Luna, was pregnant with them, she began getting sick. Her Aura was being depleted, but the doctors couldn’t figure out why. It would regenerate, but over those nine months it came back slower and slower each time, and eventually she couldn’t recover at all. By the time she went into labor, her Aura was down to almost nothing.

“Then we discovered the same was true for Jax. And doctors found that it wasn’t some inherited condition … Gillian’s Aura was, shall we say, elevated, and the two needed to be separated then before more harm came to Jax. There was an emergency operation to get them out, but it was too late for Luna. She didn’t survive the procedure.” Finn’s voice broke. “She never even saw them. I never said good-bye.

“Jax recovered, obviously. But his Aura was always at a dangerously low level. He was fragile. He developed slowly. He was hard to draw out, and …” Finn took a shaky breath. “I worry that it twisted his mind. He wasn’t anything like Gillian. Part of it was bitterness because he didn’t have a Semblance.

“She, on the other hand, had a powerful Semblance. It had caused us so much pain, but I couldn’t blame her, an unborn baby, doing what we all do: trying to survive. Over the years, I taught her to control her Semblance, and over time we unlocked her true ability—she doesn’t just sap Aura from others; she can transfer it, too. It turned out her power, which had seemed like such a curse, could be a force for good as well. She had a large reserve of Aura already, and so she shared some of it with her brother. And he began to thrive.”

“She can take Aura from one person and give it someone else?” Coco asked. “Maybe that’s why we had so much trouble against those goons in the city, and why it seemed like Carmine wasn’t taking any damage in the Wastelands. Gill transferred Aura to their fighters to make them even stronger.”

Finn looked horrified. “That’s not possible. She would never do that.”

- RWBY: Before the Dawn, Chapter 14