You know, like IWHBD or the dancing Jason Jones… the workshop grunt, suicide marine, anything like that? Or the levers in Halo : Reach… even though they didn’t do much they were still cool (minus the anniversary room where the RvB refference was, that was a very cool easter egg indeed).
…yes.
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Elite snipers
Level: Requiem
Requirement: Legendary, get the Camo but don’t progress
Reward: 4 hidden crates -
Betraying marines and Spartans
Level: Shutdown
Requirement: kill everyone
Reward: Johnson homage
I’m pretty sure it’s an easter egg because it’s the only time you get autoaim enabled against them afaik. I think doing it on Legendary might yield different results but this method is simply too time consuming.
Go look up some Roosterteeth Halo 4 videos on Youtube. I recall that they have done several Halo 4 easter egg vids.