Miasma (Ancient Greek religion)

In Ancient Greek religion, a miasma was "a contagious power... that has an independent life of its own. Until purged by the sacrificial death of the wrongdoer, society would be chronically infected by catastrophe."[1]

An example is that of Atreus, who invited his brother Thyestes to dine on a delicious stew, which had been prepared with the butchered flesh of Thyestes’s own sons. As a result, a miasma contaminated the entire family of Atreus, where one violent crime led to another, providing fodder for many of the Greek heroic tales. Attempts to cleanse a city or a society from miasma may have the opposite effect of reinforcing it.