SCP-035, or "Possessive Mask", is an SCP in SCP: Containment Breach
SCP-035 appears to be a white porcelain comedy mask, although, at times, it will change to tragedy. In these events, all existing visual records, such as photographs, video footage, even illustrations, of SCP-035 automatically change to reflect its new appearance.
A highly corrosive and degenerative viscous liquid constantly seeps from the eye and mouth holes of SCP-035. Anything coming into contact with this substance slowly decays over a period of time, depending on the material, until it has decayed completely into a pool of the original contaminant. Glass seems to react the slowest to the effects of the item, hence the construction choice of its immediate container. Living organisms that come into contact with the substance react much the same way, with no chance of recovery. Origin of the liquid is unknown. Liquid is only visible from the front, and does not emerge or is even visible from the other side.
Subjects within 1.5 to 2 meters of SCP-035, or in visual contact with it, experience a strong urge to put it on. When SCP-035 is placed on the face of an individual, an alternate brain wave pattern from SCP-035 overlaps that of the original host, effectively snuffing it out and causing brain death to the subject. Subject then claims to be the consciousness contained within SCP-035. The bodies of "possessed" subjects decay at a highly accelerated rate, eventually becoming little more than mummified corpses. Nevertheless, SCP-035 has demonstrated the ability to remain in cognitive control of a body experiencing severe structural damage, even if the subject's body literally decays to the point where motion is not mechanically possible. No effect is found to be had when placed on the face of an animal.
SCP-035 is not currently in-game.