How does gears of war 3 end

!! SPOILER!!
Just a warning to all players who have not completed Gears of war 3. If so, do not look at this answer anymore.

Ok, now for the answer.
The way that Gears of War 3 ends is basically like any other game, big boss, killing big boss and ending. You will be battling you nemesis Queen Myrrah. She will be on a huge flying bug. You will see how to kill her on the game. The objective is to stop and kill Queen Myrrah from damaging a machine which will kill all locust's and Lambents (even lambents inside humans).
After when you killed her, you will find that Marcus's dad will die also because the lambent poison has infected him to much, basically the machine will kill him like all other Locust's.

After all this and that, Marcus sits down, takes his hat off (for the first time) and Boom! Done!