Illumination

Because it was better than thinking of anything else she might complain about regarding being trapped in an abandoned mine with a collapsed entrance, Nico said, "You know what I hate most about this? Not being able to see a thing."

Her companion did not answer, but there was a brittle little crackling noise, and a faintly glowing, angular object between their thumb and forefinger.

"Oh, thanks. What is that?"

"A piece of my soul."

"And it... glows."

"Temporarily. It will last a few hours."

"Um. And that's no problem, ripping a bit off your soul?"

Her companion seemed as confused at the question as she was at the whole thing, but after a moment answered, "It will grow back."

"OK, then."