Grandpa

The "Grandpa" is a unique hostile mob that takes the appearance of an undead, withered old man in tattered dark-green rags and black pants, splattered with blood. His eyes are completely black with small white pupils and blood pouring out of them.
Along with the Alarm Monkeys, he is the one of the only mobs who can be only be encountered in the eponymous "Grandpa's House" nightmare. The mansion consists of five floors and underground basement area, which is connected to a sewer system and contains a bunker and a prison block where Grandpa's victims are imprisoned for experimentation, help compensate its incredibly spacious and expansive structure. In Grandpa's House, there are four different methods to get out—by car, helicopter, boat, and the actual exit. In order to escape, the player will also be required to gather a particular item.
Throughout his dilapidated old house, Grandpa will patrol the corridors and actively look for the player's presence. He will attempt to repeatedly attack the player with his barbed fire axe, which delivers a total of 10 damage, if he detects them. Grandpa can also construct and lay down bear traps everywhere around house, which, if the player steps on one accidentally accident, can injure and trap them, as well as notifying Grandpa of their whereabouts. He will also rush toward the player if he is seen by the surveillance cameras that encompass his home. Grandpa, like the Warden, can hear everything that the player makes (although Grandpa still retains his somewhat intact eyesight), therefore he will be drawn to any disturbance, such as opening doors and chests, the player's loud footsteps if they step on unstable floorboards, destroying blocks, the Alarm Monkeys' screeches, and any projectiles that the player throws. 
Due to the player's sudden lack of weapons in the nightmare, trying to kill Grandpa is incredibly challenging and virtually impossible because he has over 300 health and therefore can regenerate his own health extremely quickly. He usually moves along with the player at the same pace.
In order to avoid Grandpa, the player must either flee from him, hide somewhere in a safer place, especially underneath beds and closets (however, if he discovers that the player is currently hiding, he'll kill them instead), distract him by flinging objects or demolishing blocks, or intermittently stun him with the Fire Extinguisher and knocking him out with a Colt-Python revolver or a Tranquilizer Gun, both of which are found as loot inside of chests scattered throughout the house. When Grandpa is chasing down the player, his chase music will play out, which sounds like this.
Category:Hostile Mobs
Category:Undead Mobs
Category:Mobs
Category:Entities
Category:Hallucinations