E.G.O equipment (Short for Extermination of Geometrical Origin) is a recurring theme in Project Moon media. They can be used by characters in order to enhance their fighting prowess. They can take the form of weapons, clothes, items, or locations.
E.G.O may manifest in two manners:
Prolonged usage of extracted E.G.O one is not fully qualified to use or with low levels of sanity can result in E.G.O corrosion. This results in the user transforming into a form similar to the abnormality the E.G.O was originally extracted from.