Mine is the hunters on legendary with almost all skulls on. I swear they are near invisible.
Which enemy do you hate?
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Jackals for me. On legendary they will OC your shields constantly and I find them harder to take down than a typical elite. I save frags specially for them and always like to know where the nearest Plasma Pistol is when I run intt them. There is a certain satisfactin with unloading a clip of needles at them, pinging their sheilds with the AR/M-6D and watching the needles riddle them when they roll away from you.