....darkness. Great.

Sierra had been following a series of bright arrows, but here in the darkness, she couldn't see much of what lied ahead. She experimentally put a foot forward and tapped the ground below her. No water, at least not yet, so she wasn't headed for the lake. "Lumos!" she said, lighting up the general area of the tunnel so she could see what was ahead.

An arrow. Perfect.

She followed that arrow toward another arrow, and so on, so forth, until she reached an area where she could see light just up ahead. Maybe the end of the tunnel she was in? Hopefully, and so with her wand lighting up the path before her, she crawled toward the light source. Reaching it, she found that it was the size of a snitch, definitely not big enough for her to crawl through, and so she ended the light charm and raised her wand toward the tiny hole. Slashing downward, she said, "Diffindo!"

The hole broke off into two large halves, and Sierra crawled through.