Armamageddon

The Armamageddon is an even that occurs in The LEGO Movie 2: The Second Part. Its name comes from "Our Mama gets in," and it occurs near the climax of the movie. Rex Dangervest is the event's catalyst, and he wishes to get revenge on his friends for leaving him behind. It triggers when he fools his past self, Emmet, into ruining Batman's and Queen Watevra Wa-Nabi's wedding by smashing their cake. However, Emmet regrets his decision and tries to get revenge on Rex.

Details
When it manifests in the LEGO Universe, the Armamageddon takes on the form of a small black hole. Its size increases as it sucks in different realms.

In the real world, Finn and Bianca are arguing, and their mother reprimands them by forcing them to put their LEGO sets away, then confiscating the sets.

Aftermath
As a result of the Armamageddon's effect, Wildstyle and the other LEGO minifigures manage to find their confidence and go to reverse the cataclysm's effect. Meanwhile, Emmet and his former friend turned foe Rex fight under the Dryer. Rex manages to get the upper hand against his past self until Lucy (who escaped) then manages to save Emmet from Rex's rage. Rex reforms himself and regrets his past decisions, as the redeemed villain's time-travel machine disintegrates. He tells Emmet to be strong and upbeat, before the redeemed villain fades away into nothing...

Trivia

 * This is the first time the LEGO universe is destroyed. However, the events are unddone.