Been playing religiously since year 1, and even still with Rise of Iron. Regularly do raids, trials, nightfalls; 3 of coins, exotic leg engrams, Shaxx bounties. It is literally the only exotic I don't have. I stopped counting after 50 exotic leg engrams....Nothing.
Something is wrong with this drop rate.
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I had the same problem as well with sunbreakers, finally got it last month after getting like 5 khepri's stings in a row.