Board Thread:General Discussion/@comment-35806478-20190408161347/@comment-27136653-20190426044306

It's a payback for what you've done. A deux ex machina that transformed Chara into a being capable of destroying the entire world, along with setting your game into a new state in which you're stuck in a dark room with howling wind.

It doesn't make much sense from an inside view, it's more of a "4-th wall" or "outside" event that's directed at you, the player.

So when theorizing about it, you're free to take many liberties.