Now you see me now you don't.

Item # SCP-XXXX

object class: Euclid

Special Containment Procedures: SCP-XXXX must sealed within a sealed an airtight room. the entire facility must consist of airtight doors and sealable ventilation. no ventilation may be used within SCP-XXXX containment chamber. camera footage must remain active at all times within SCP-XXXX. Should SCP-XXXX not be present within its containment personnel are requested to wait 24 hours, should SCP-XXXX not reappear the sites ventilation must be sealed along with the airtight exit doors.

Testing has been halted due to the risks of containment breach. Personnel are not to enter SCP-XXXX containment unit, in addition contact must not be made with SCP-XXXX.

Description: SCP is a large humanoid figure 1.7 meters in Height. SCP does not posses body hair or eyes. and hollow holes taken its place. SCP-XXXX face is mask constructed of basic cardboard, upon closer inspection the mask is part of its face. The entity has the ability to turn in a gaseous form in addition, the gas cannot be detected unless the entity reforms into its solid state. Due to this, SCP-XXXX cannot be harmed by physical means. SCP-XXXX does not require food to sustain itself.

SCP-XXXX in its solid state is extremely aggressive and has a large amount of physical strength. However, the entity can be forced into its gaseous form if you provoke it, by physical damage to its solid form. Thus damage by SCP-XXXX can be avoided.