In terms of armaments, the Versailles-II Ultra Custom, or Ultra Versailles, features a large array of powerful weaponry. This includes it's twin-barreled Hyper Beam Rifle and it's immense High Mega Cannon, the Claíomh Solais.
The cannon is mounted in the center of the Ultra Versailles's head. This particle beam weapon has a power rating of 720 TW, making it the most powerful beam weapon used by a mobile armor, as well as one of the most powerful weapon mounted on a mobile armor ever. The power of the high mega cannon's beam can seriously damage a mech with even a glancing hit, and can completely destroy a standard mobile armor shield making it impossible to block the beam. Furthermore, it produces a laser beam so strong, some of the laser's emitted light scatters out at various wavelengths, causing the 'rainbow beam' phenomenon. However despite being a powerful weapon, its power is also a weakness as the Ultra Versailles's fusion reactor is unable to handle repeated usage of the high mega cannon.
There you go, Me23456789. I've finally made it, a mech that spews rainbows, though it's not from the mouth, it's forehead is close enough!
The overall of this design was heavily inspired by the Aile Strike Gundam and Force Impulse Gundam, as well as the Double Zeta Gundam for the idea of a head mounted deathbeam!
@Sylphion: Well, yes, Photoshop had something to do with it since I was specifically talking about the Giant Rainbow Beam (That's the technical terminology for such things, right?) exploding from the Versailles-II's head, but the rest of it is spectacular as well.
Quoting Me23456789 ("Me2" or "Me")
That... Has to be the best thing I've ever seen! XD Brilliant work! I especially like the shield and the new weaponry. And the head-cannon is great! Where did you ever get that idea from? ;)
Hmm, I wonder where indeed. On a side note, it probably looks great because of my somewhat decent skill in photoshop! I really had fun with the rainbow laser beam, in fact.