Darkness Returns to the House of Loud

(Sequel to Darkness Falls on the House of Loud)
When young Lucy Loud tampered with forces beyond her understanding, she never imagined that her curiosity would cost her her very existence. Twenty-two years later, the Louds of another timeline are faced with the lingering consequences of those actions. Trapped within a realm of pure darkness, the Louds find that there is more to fear than what lurks in the shadows.

Recommended to read this first:
https://www.wattpad.com/story/185726188-darkness-falls-on-the-house-of-loud-loud-house