Simple answers to complex questions.

Some players don't experience these glitches; my friends didn't have them either, but I did. I completed all missions and tasks in the game, gathered 20 dragons, but the darn portal still wouldn't let me pass!!! I figured it might be a typo by the developers and decided to gather 200 dragons (I tried to complete it with spectral dragons both times), but the evil portal still wouldn't let me through.... Since I had completed everything and gathered a huge army, I felt justified in using the code to win the mission.