He's back

Error sans, the destroyer. Everyone knows this. Everyone has theory's why he destroys.
Some say he's forced by the Entity known as Fate.
Some say he does it purely because he only wants one au to stand.
Some even say he does it because he finds it thrilling.

only one of these is correct. but which one is the right one?

One day, Error sans had become dusted by a surprise attack. It shocked the whole multiverse, mainly because they all thought he couldn't die.

..... Then, one day years upon years later, an AU gets destroyed.