One of the most infamous aspects of her rule was the use of torture and execution. Wu Zetian was known for her cruelty, and those who opposed her or were deemed enemies of the state suffered gruesome fates. The most notable example of her ruthlessness was the case of the Tang royal family members and officials who plotted against her. Many were killed, and some were subjected to the worst forms of torture.
In interactive fiction, such as visual novels or text-based RPGs, a "Bad End" is traditionally a failure state. However, in modern dark fantasy, these tragic conclusions are often treated as the narrative peak of the work.
(like itch.io, DLsite, or a specific forum), I can dig deeper into those specific archives for you.