Wendigo Mask

Origin
In Native American traditions, humans who became overpowered by greed could turn into wendigos. People or corporations who wreak environmental destruction, who destroy communities with their greed and racism start to suffer from Wendigo Sickness. Although descriptions can vary somewhat, common to all these cultures is the view that the wendigo is a malevolent, cannibalistic and supernatural being. The masks were made as a warning to outsiders encroaching on their land however people think it's funny to put them on and scare each other. The anger of the Native American tribes at the insult against their beliefs turned one of the masks into the artifact.

Effects
When worn, person becomes a cannibal, murder with insatiable greed. Even when the mask is removed the victim still acts wild until it is neutralized.