It was bound to happen eventually, you know. I am a paid Halo expert and all. Today marks the first appearance of a Halo vehicle in the Top 30, and in true Counterfett style, it's a good 'un.
#21 Covenant Wraith
For all of those who drove a ghost hovercycle and thought "Gee, this is great, but I'm kind of exposed here. I wish I had a tank version of this, with a little more armor, and maybe a cannon." It was for such people that Covenant Engineers made the Wraith. It's a floating engine of destruction. And it's got a mortar that shoots flaming balls of...plasma. Later versions (Everything after Combat Evolved, I believe) also have a cupola mounted Plasma Cannon. For extra butt whooping.