Halo 3:killing those annoying fat wraiths

I hope this helps

When killing the large wariths that throw huge plasma balls at you, you can approach it two ways:

1) Approach from behind while it's fire is being held, or sneak behind it and destroy the button contraption to destroy the whole warith or if you can, climb on the back, plant a plasma grenade on it and run.

2) Dodge it's shots moving side to side, until you get close enough to climb on the front using RB, and plant a plasma grenade on it. Or any grenade for that matter.

It's really best if you can sneak behind it. Just run over the rocks and stay close to walls while the wraith is distracted and soon as you get behind it, DONT WASTE TIME! Just hurry and shoot it out or plant a grenade on it while you can.