Beat Crota on hard last night with 5 on first run. 2 32's and 3 31's. As long as you have a coordinated team who knows their part, you don't need "only 32's" or "Max gjallarhorn only". Work as a team, have heavy ammo, and do your part. I'll take skill and teamwork over level any day.
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Try a 30 next time. A 31 is basically a 30 on normal, nothing new