Only One [hermitcraft au]

I thought I'd have a go at writing this up, even though I have ZERO writing talent. But here goes...
This au takes place in a hardcore setting (once someone dies, they can't respawn). It is set during the mayoral race, when Mumbo and Grian's campaign isn't doing too well. They both decide to confront Grumbot for one last-minute idea before voting day. What Grian didn't expect was that Grumbot had a much sinister way of dealing with things than they originally thought...