All three are possibilities, I think?
What I want to know is what happens when a /Marauder/ does that instead. It would probably just be much more likely to turn into a fight at that point, maybe with the Champion trying to take the weapon, but eh...>>57888437
Well... Tzeentch wouldn't be able to scheme anymore if he won, Khorne would probably lose out on blood/skulls, and Slaanesh doesn't get to do horribly amazing and amazingly horrible things anymore.
Nurgle would probably be good with a final victory, what with being stagnation?