Semper (also known as player.mdl) is a well known Garry's Mod creepypasta. It appears to be a grey, humanoid figure. The creepypasta about Semper dates back to 2017. The legend states that he appears in old GMod servers and singleplayer, then teleports around the map and stalks the player. If a player sees him or gets too close to him, he will immediately teleport away.