An ancient pact was made by the Walkarcel family, requiring periodic blood sacrifices in exchange for prosperity and wealth.Mysterious disappearances of members of the Walkarcel family every few generations.The discovery by the young Mercedes Walkarcel of an ancient altar and rituals in the basement of the family manor.Marcel Walkarcel's confession and his ultimate sacrifice to save his son Arthur.The attempts of the priest and the mayor to reveal and understand this ancient mystery.The Walkarcel family have been the guardians of a terrifying, ancient creature that inhabits the underground lake beneath their mansion for centuries.A pact with this creature ensured the family's prosperity but required regular blood sacrifices.Attempts by previous generations to break this pact ended tragically.Marcel Walkarcel's final sacrifice was not enough to break the pact completely.The entity is still waiting to recover its "due" victim and take revenge on those who tried to stop it.The Walkarcel family, together with the priest and the mayor, decided to reveal this ancient secret in order to deprive it of its power.The Walkarcel mansion was demolished, and the underground lake was filled in to prevent further contact with this terrifying creature.Although the imminent threat has been contained, the people of Tarazona know that this ancient darkness has never been completely overcome and is still waiting to regain its "due".This story has become a permanent scar on the collective soul of the community, reminding us of the need for transparency and courage in the face of ancient evil.