Weapon - Plasma Pistol*
These are the weakest guys in the game, they like to travel in packs though so can therefor be dangerous. When you kill one the rest will run away for a couple of seconds then come back for more. Best weapon for these guys is Rocket launcher or Assault Rifle if there is lots of them, or Pistol if theres a couple.
*Some people say that some grunts will use a plamsa rifle, though i have never seen one.
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Weapon - Plasma Pistol
These guys are about as weak as grunts in health but have 2 major advantages over them, they carry a shield around that can be hard to break through (Use Fully Charged Plasma pistol for 1 shot to take out shield). They also have a much higher rate of fire, they can fire as fast as you can even if your tapping the trigger as fast as you can.Best way to take them is snipe the holes with a pistol or use human grenades
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Weapon - Plasma Pistol,Plasma Rifle,Needler
These are the hardest guys to fight on legendary they are the field commanders of the covenent battle forces. They are also intellegent and can dodge grenades very well. I use plasma on the shield then bullets on his raw health.
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At first they may seem hard but I found these guys easier than jackals one pistol shot to the orange and they're dead. When fighting them avoid using covenant weapons and aim for the orange areas for they're armored everywhere else.
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Damage - 1/10 for Shields, 8/10 for raw health
These little guys always come in big numbers and aren't really a threat if you have a shield, but if your shield is gone they suck your blood and do really fast damage, one hit from anything, even melee attacks will kill one
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Weapons - Anything except for sniper rifle
These are the only opponent you'll fight that has human weapons some of them will even get back up after you kill them. I focus on the ones with human weapons first cause they do more damage to you
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Damage - 6/10
I love it when i see these guys, 2 pistol shot will kill them and they blow up and kill some of the other flood at the same time. but when they blow up they spawn 6 Little floods. Sniping with pistol is best for these guys