The Mantis is a UNSC Marines mech first seen in Halo 4.
About this creation
The Mantis is a manned mech armed with a machine gun, 5 missile pods, and the ability to teabag the enemy bodies (It's Halo, of course it teabags!). See the reveal of the Halo 4 Mantis on Youtube: click here
(after reviewing that video, I realized that the hips don't stick out far enough on my moc...time for a V2 already!)
In some poses, the Mantis moc can stand on its feet without any problems. This pose is not one of them:
Fits a minifig:
LDD instructions available. Click the link under where it says "Building Instructions."
Three notes about the instructions: Floating pieces connect to nearby pieces (technic pegs in the bottom of bricks, tiles connect in clip pieces, etc), the pink screwdriver pieces should be replaced with black cut flex tubes, and the lime green pieces can be any color you want since you won't see them in the completed model.
Halo meets Mechwarrior, why am I not surprised.
Thumps up for accuracy. My first impression from the video was: quite imba, but on the other hand, there was no real fighting back from those Banshees and the scorpion was didn't even move. So it might only be some showing off the new stuff.