"Lumos," Hermione whispered, descending the stairs with practiced ease. She didn't flinch as the hole sealed shut above her with a resounding snap. Cold, stale air enveloped her as she continued downwards. The sounds of her footsteps echoed in the emptiness. Hermione cast a quick warming charm as a faint glow appeared just below her, the light growing larger as she drew nearer until she'd reached the bottom.