What do you think is the fair amount of shards/energies is for killing Crota if its your only reward?
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Irrelevant to if it was your "only reward" through the raid, as shards and energies are rewards, just lesser ones. I would say 3 for a crota kill is a little more generous, if it has to be on the loot table at all. I think only weapons or helmet would be ideal, because then you could always dismantle the weapon/armor for the shards/energies anyway.