The Aerico is a demon from Greek mythology who lurks in treetops. It particularly likes to inhabit old cherry trees and will attack anyone who attempts to climb its dwelling. If someone walks into the shadow an Aerico’s tree, their hands and feet will swell.

Alternatively, the demon is described as a harbinger of disease. In these instances, the Aerico is believed to drift invisibly through the air, though it may occasionally take the form of a human. As a disease demon, the Aerico is believed to have spread malaria and the plague.