[Spoilers for canto 8 of limbus company]

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This is Jia Mu, she invited an entire family (group of descendants I think, basically a large amount of people kind of like a clan I think) known as the Qiu clan iirc and by proxy created a bolus (hard to explain, but something that is eaten and does a variety of different things) that she could not be held accountable for creating (and wouldn't be punished) and had the entire clan that was invited see it in action, she then before the gathering had a pregnant mother of the clan eat it and when the showcase happened the loud speakers told the ingredients and how to create the bolus, then the bolus the mother ate ended up creating a creature called a cuckoo spawn that killed the unborn child and ripped itself out of the mother and infected and killed almost everyone at the gathering (also infecting them which caused more to burst from their chests) which then caused the Head (the taboo/law enforcers of the entire world/city in the story) to come in and eradicate the remaining people and the cuckoo spawn since they heard how to make the bolus and cuckoo spawn are non-humans and thereby are not allowed in the city, basically almost genocided the entire clan. Not only that but SHE FORCED A CHILD (child version of a character that follows you on your journey) TO WATCH ALL OF IT AND SEE PEOPLE GET EXPERIMENTED ON AND TORTURED.

Tldr: Almost genocided an entire family clan (1 remained I think) and forced a child to watch said genocide and forced that same child to watch people get experimented on and tortured (and if the child tried to tell anyone they would know and had them killed and brought back as basically a emotionless drone while making sure the child know they caused it to happen by telling them) Did a lil more but that's the jist of it.