Control. Slash. Delete.

A.U.s have suddenly started to disappear, even ones as popular as HorrorTale and UnderSwap. The only ones unaffected are all who live outside of A.U.s in the Anti Void and the Creators and the Destroyers, but even here there is an issue. Nightmare Sans has disappeared too, not only him but Dream! Error knows something but will not say anything. What could be so powerful to make A.U.s just go like that that no one knows about? With each passing day more A.U.s go!
What ever this great power is, enemies must unit to stop it.
Differences must be set aside.
Everyone left must work together to stop this rising problem before it is too late.
Can the missing universes be brought back or is it too late?