your welcome :)
and yep if not level 50 yet thats the mystery solved :D
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Of course, the other way to do the Island Expansions is attrition. Since you aren't on a timer like a normal Adventure, just send wave after wave of First Strike generals (two of the Champions, MMAs, Dracs) with 1R each and just keep chipping away. Takes months, but no-one is timing you.