User blog comment:MasterCharmander13/DWA - Season 4 Part 1 "Stormaggedon" Finale Hints and Teasers/@comment-28119130-20150620112533

I think that the portal might lead to the Great War (which is maybe the Time War).

The secrets were done brilliantly! :D I could write a few sentences about them here, but I won't spoil it for the others! :P