stuck at lvl 12, can't do mars because of the lvl 15 missions, can't do strikes because the last 3 teams i played with have quit. Great game, so fun.
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Got my alt to lvl 20 in under 8 hours Grind until you can solo a strike, grind your bounties... They help a LOT. Don't worry about progressing the story until you're higher level.. Or do what other -blam!-s do and loot cave it