***SPOILERS***
Yeah I feel kinda dumb but I gave a god item to my "friend" bishop and now I am supposed to fight him, but he is invincible is there any command or other way to kill him?
Pause the game. Right click on Bishop. Open the console (use the ~ key). Type in
DebugMode 1
Hit enter. Then type in
SetCON 1
and hit enter. Close the console and try attacking him now. This will reduce his hitpoints, but that may not help depending on what the item you gave him does. I think there may be a kill command. With have to have a look.