The Patriarch is a boss.(I am too lazy to write more) OVERWATCH KILLING FLOOR
Killing floor is a game where you kill Enemies called Zeds, in the first game normally there are 9 zed types + 1 boss, you need to kill a number of Zeds in order to progress to the trader stage at which you buy weapons and armour, and you do that again and again until the final round where you fight The Patriarch. This Gamemode is based off of the 2009 game Killing Floor 1.