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I'm not sure what the question is.. Should you do crota norm?? Absolutely!!! Should you level your gear to light 30?? Again, absolutely!!! Strive for 32.. Can easily pick up a few light 36 pieces in a normal crota run, then throw an exotic helmut on top and 31 is an easy reach.
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should be fine as long you got an excellent fireteam. hell, i remember having a 29 and doing it normally. crta normal mode is a joke and the only reason why hard mode is actually hard is due to the level disadvantage - meaning that when the new lvl cap is given hm will also become a walk in the park. if ya need help, don't be afraid to ask