- Sliding Ghost
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Depends on the combat range.
In close combat, it would have to be Ultra Elites. But in other ranges, they can be defeated easily. Plasma bolts work best. Works best if there's no cover (like cars and forerunner structures) and/or if they don't seek cover. I found that dual wielding Elites present the most threat. I also found that Grunts and Jackals can be a threat if left alone.
There's also Stealth Elites, but again, it's a matter of distance. They won't shoot you if you're some distance away from them. The only threat they present is if they approach you.
In long range combat, it's obviously Jackal snipers. But they're vulnerable. I ought to give sniper alley a go sometime to see for myself what they're capable of.
[Edited on 04.05.2011 11:36 AM PDT]