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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They better not have the ODST/Reach skull system where you don't have to find them, I always found finding them so much more fun. Especially when they will be on various planets.