Monster 1 (A.K.A. Security Guard) is the first monster encountered in the Karamari Hospital DLC.
Monster 1 wears a blood-soaked security guard outfit, a black necktie, and black shoes. His eyes are missing, a dark discoloration surrounds the sockets, and he lacks a mouth. His most prominent feature is his arms, which are hideously swollen from the elbows down with no visible hands or fingers.
Monster 1 appears past the sealed doorway after the power has been turned off. At first, he stands motionless, blocking the stairway. However, he will start to move if the player enters one of the side rooms and re-enters the main hallway.
He deals about 45 damage to the player with a 1 second cooldown. In the HD Renovation, he has a 3 second cooldown between each hit.
Swinging the Sword at him six times will successfully kill him. He will not respawn even if the player leaves and re-enters the room. It is possible to kill him when he's blocking the stairway.
In HD Renovation, killing The Virus with the sword will kill Monster 1 as well. Monster 1 does not have a hurt or death sound in this version.
He will slowly wander around in a seemingly random pattern and, if the player gets too close, he will slowly turn towards them.
|"Bleh Wind" (chase theme)|
- When he is standing in front of the stairway, he will not damage the player even if touched.
- Monster 1, The Virus, and Monster 3 are the only enemies in the DLC to have animated models.
- Monster 1 is the only monster from the DLC not to be included in Endless Mode. Monster 2 was added to Endless Mode for the HD Renovation.