Fire Prism
A Fire Prism is an Eldar heavy anti-grav tank that looks exactly the same as a Falcon except for one minor detail: the prism cannon mounted on its top which is capable of wrecking your prized Predator Tank in moments. The cannon focuses a beam of intense light within itself and then unleashes it in a blast of glory which can melt lesser tanks to pieces.
Another funky addition is the fact that a prism cannon can increase the power of another, combining their beams into one huge blast of 'fuck you!' at the enemy. Not anymore. Now it can be fired in one of three modes: "dispersed", low AP pie plate MEQ killer, "Lance", high STR anti-vehicle with the lance rule, and "focused" decent STR small blast used for tricking you into thinking you have a third option when in actual fact you will be using the other two modes almost exclusively.