I am currently ruminating on a horror one shot idea.
Core premise is that some people, including children, have gone missing from a nunnery, the orphanage attached to the nunnery and the nearby villages that donate food and other supplies to the nuns, local authority is busy with other matters and therefore deputises the PCs and sends them to deal with what they assume to be wild animals or a serial killer.
What's actually happened though is that several residents of the nunnery and orphanage are concealing severe sorrows, loneliness, regret, guilt and so on, which has served as a beacon to Sorrowsworn who are now preying upon the people of the area.
Ideas for specific beacons I have so far;
Mother Superior Annalise, an extremely elderly nun and the leader of the convent. She harbours a lot of guilt over many people she feels she failed over the years, most significantly many victims of a plague who she euthanized in her younger years in order to minimise their suffering. She keeps a length of string with a knot tied in it for every person she killed during her time as a nurse in a wooden box in her nightstand. Her many regrets have attracted the Wretched.
Sister Marianne, a middle aged nun. She has never managed to let go of a lost love from her youth, a fleeting childish romance that ended in heartbreak. She keeps letters and a locket from her old beau, hidden under a loose floorboard her cell. Among others, she has attracted the Lonely.
Eadric, an orphaned child in the care of the nuns. Eadric was abandoned by his parents and hasn't managed to come to terms with it. He's angry, angry at his parents for leaving him, at the nuns for making him stay at the orphanage, at rules, at life, at the gods, but most importantly, angry at himself. He feels he must have done something wrong, that it was his fault he was abandoned. His self-loathing and emotional outbursts have attracted the Angry.
Sigeburg, a farmer's child from the nearby villages. Sigeburg was close friends with one of the missing children, the first to dissapear in fact. In truth the child fell in an old mineshaft and died while out playing with Sigeburg and some of the other children. Frightened of getting into trouble the children lied, claiming to have no idea what happene to their missing friend. Each child that had been with Sigeburg that day is now gone. Taken by the Lost.
Cedric, a halfling from one of the villages. Cedric is the abused and rejected member of his family. Suffering from a mental disability that his family wasn't able to cope with, Cedric has spent most of his life locked in a spare room by his kin. Fed barely enough to keep him alive, beaten into passivity and quiet by the family that wants to forget he exists. Cedric's suffering has drawn the attention of the Hungry, but so great is his suffering that all Sorrowsworn are drawn to him.