SCP-173
It is constructed from concrete and rebar with traces of Krylon brand spray paint. SCP-173 is animate and extremely hostile. The entity cannot move while within a direct line of sight. Line of sight must not be broken at any time with SCP-173. Entity will attack by snapping the neck at the base of the skull, or by strangulation.
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INGAME
SCP-173 is considered to be the main hostile entity the player will encounter, it will attempt to kill the player be moving into towards the player and attacking at close range, however while being observed by the player it cannot move. However if the player looks away or blinks 173 will move at a very fast speed towards the player.
There is no effective way to halt 173 aside from closing doors to impede it and putting significant distance between yourself and it so it loses interest of the player. 173 will always attempt to attack the player and cannot be hidden from or avoided once it has detected the player.
SCP-173 DISCUSSION
#1SCP:CB Administrator. 99% of my statements are my own and do not represent the official developers viewpoint.