On Heroic. It's actually pretty fun because it isn't [i]too[/i] hard but it still makes covenant much scarier. Also, anytime an Elite whips out a Concussion Rifle, your life will be hell for the next few hours as you try to kill him. And Hunters are almost unkillable. You know what, AMA.
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My friend and I on Legendary hijacked two Wraiths and a Banshee in the same run. Oh my god it was amazing. Our strat for any elite is stay back and take turns running in for the kill. Since you're solo, what'd I do is actually stay close; they seem to be less accurate closer. However, when he comes in for a punch, strafe and try to punch back.