Per 
Item #- SCP-XXXX
Object class- Euclid
Special Containment Procedures- SCP-XXXX is to be kept in a windowless cell which is only to be opened only with express permission from the O5 council strictly for assistance with field operations. In this cell, SCP-XXXX should be permanently blindfolded and administered nutrients necessary for survival via a drip feed which should be checked and maintained every 12 hours. Personnel entering SCP-XXXX's cell should have all bare skin covered by an abiotic material such nylon or polyester, in case SCP-XXXX tries to attack.
Description- SCP-XXXX is a non-corporeal entity which can inhabit the body of any living human, (iterations of which will now be referred to as SCP-XXXX-a) via means of direct eye contact. Only one instance of SCP-XXXX-a can be controlled by SCP-XXXX at any given time, and abandoned hosts lose all signs of brain function when disconnected from SCP-XXXX. Instances of SCP-XXXX-a retain the appearance of the person who has been taken over, except for its eyes and several other vital organs which have been replaced by identically functioning replicas made from an black crystalline material with a similar transparency and durability to glass.
If any biotic material makes direct contact with the skin of SCP-XXXX-a, the biotic material will be instantly converted into this black crystalline material up to 9 centimeters from the point of contact. SCP-XXXX has been known to use this trait to its advantage in combat, targeting sensitive areas such as the throat or heart to convert into crystal in order to efficiently kill its target. SCP-XXXX has also been observed using its ability to switch hosts via eye contact to combat advantage, taking over targets to escape impending damage to its current form, or to dispose of difficult opponents. This type of behavior indicates that SCP-XXXX has some form of sentience, but no attempt to communicate with SCP-XXXX has been successful so far.
Addendum 1
