Board Thread:Wiki Discussion/@comment-30183199-20161009145047/@comment-27701762-20161015041745

Step 1: Asgore absorbs one human soul. This gives him enough power to cross the Barrier.

Step 2: Now that Asgore is outside the Barrier and within the human realm, he absorbs six more human souls one way or another. This gives him sevel human souls, enough power to break the Barrier.

Step 3: Asgore returns to the Barrier and destroys it, now having the full power of seven human souls. The monsters are now freed.