So, COG only opened a partial portion of this event; hopefully this will fully open next maintenance. For what has opened, it may seem confusing leveling the feature. Here is what I have found. After you rouse level I and you have enough frags for level II and III, just hit "Rouse" again, even though it doesn't show the frags for level II and III. It will automatically level the feature if you have the appropriate material to do so.