If you could bring in another faction from another game, movie, or comic universe which would you pick?
I'd bring in the Covenant from Halo or the Reapers from Mass effect. Grunts running and screaming in the hellmouth would be hilarious. I could imagine reaper forces dropping in for a public event.
[spoiler]If you got the #Everyvillainislemons reference you get +1 interwebs.[/spoiler]
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You already have the Covenant, they're just called the Fallen in Destiny. And tat's not a joke. They look and move EXACTLY like the Covenant. There is ZERO imagination in Bungie's enemies list. It's just a list of poorly reskinned Halo baddies.