The Phantoms were effective dropships, but couldn't deliver the punch necessary for effective infantry support. This prompted the development of the Revenant which was designed specifically for the ground support role. Armed with a single plasma cannon, mounted on the bottom of the craft, the Revenant is capable of devastating UNSC infantry and armor, but is entirely dependent on Banshees and Seraphs for protection from enemy air units.
This is one of my favorite views, because is shows off both the front fins and the back one.
another angle shot, I got the front just by messing around with my dark blue pieces, most of which went into this model.
I noticed all covenant vehicles have greebles on the bottom, so kept with that trend.
And the photoshopped picture, not as exciting as my UNSC WASP picture, but it will do for now.