Backgroundpony 
"[@Ihhh":](/1659289#comment_6929503
")
[@northern haste":](/1659289#comment_6929593
)
Is the conflict resolved. Yes
Did it come unexpected out of nowhere. Yes
Can the story closed easily. Yes
Just because Doomsday devices are usually the catalyst for the story it does not mean it can not be used as a deus ex. It depends on the writing.
Most people/writers just DON`T want the story to end like: Oh the Character A (hero) going to win, but here is a bomb for Character B (villain). Boom. Hero dead. Go home.
You would really have to make the audience root against the hero to not get massive backlash on your book, movie, theaterplay.
So yes theoretical there is a negative deus ex machina, but I am not aware someone has ever pulled it of successfully.
"
[@northern haste
Is the conflict resolved. Yes
Did it come unexpected out of nowhere. Yes
Can the story closed easily. Yes
Just because Doomsday devices are usually the catalyst for the story it does not mean it can not be used as a deus ex. It depends on the writing.
Most people/writers just DON`T want the story to end like: Oh the Character A (hero) going to win, but here is a bomb for Character B (villain). Boom. Hero dead. Go home.
You would really have to make the audience root against the hero to not get massive backlash on your book, movie, theaterplay.
So yes theoretical there is a negative deus ex machina, but I am not aware someone has ever pulled it of successfully.