I love games that have Easter eggs, and with a game like Destiny, there can and should be a lot of them. But Halo 3s skulls were really awesome, they were hard to find and rewarding, and it was fun looking for them. That's why I think they should be in Destiny, giving the player something to look for, and something to help remind us of the good old days.
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It would be cool of there was seven or thirteen 'artifacts' that are well-hidden and difficult to get to, just like the skulls in Halo 3. I like this idea.