I just beat oryx on my Titan for this week and I had 37 shards, when I killed him me and several other people in my fire team lost there 20 and didn't receive any extra drops. It was all of our first time beating him for the week and personally only got 2 shards and 1 cheats BUT IT TOOK MY 20 SHARDS!!! Please help
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The 20 shards doesn't guarantee a drop. It only increases your chances of drop. You lose the 20 whether you get rewarded or not (just like the 3 of coins)