Why would you farm powers at 70?
PEG's are mixed with SEG's, and those are blue. They give you like 60 XP and just as little SP.
At 69, I'd stay with Nachals or warriors/soldiers.
Yeah nachals are packed, its no secret. Everyone has to hunt for a spot in the cave, its nothing new. If PEG's are the only thing open, then w/e ... at least its open.
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