"Darkness," Sheena confirms with a nod. "Luna is the Spirit of Light. Each Spirit has an opposing element that balances it. They have to, or the balance in the world will be very off."

Sheena wouldn't consider it a correction--more of a clarification since "mana" seems to mean different things on other worlds.

She tilts her head and listens intently to Nita's explanation. "So, when you say 'kinetic energy in a toaster', you're talking about the electricity moving through it, right?"

And surely not the toaster itself moving.