Board Thread:Roleplaying Boards/@comment-26896434-20160407105739/@comment-26814804-20160429000021

(1: It is very possible that Chara was bluffing about destroying the world, given that they never actually prove that the universe is gone, they could have even just locked you in a dark room and told you that the world was gone. I don't beleive this, but it's possible.)

(2: They were only able to do that after every single magic user was dead, and the world therefore had no protection. They also probably had the six human SOULS.)