Talk:Neutral Route/@comment-30223799-20161014071813

The protagonist was able to leave the underground because, as mentioned earlier in the game, it would take the power of almost all of the monster souls to equal one human one. By the end of the game, when Asriel destroys the barrier, he has control of almost all of the souls from the Underground, except for Asgore, Toriel, Sans, Papyrus, Undyne, and Alphys.